{"Bibliographic":{
"Title":"Southwest Fisheries Center Monthly Report: August 1975",
"Authors":"",
"Publication date":"1975",
"Publisher":"Southwest Fisheries Center (U.S.)"
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"Language":"English",
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    "content": "EN NT OF COM\nPAR\nMERCE\nUNITED\nMERICA\nSTATES OF AM\nHONOLULU\nLA JOLLA\nTIBURON\nSOUTHWEST FISHERIES CENTER\nMONTHLY REPORT - AUGUST 1975\nRESEARCH HIGHLIGHTS\nPAGE Fishery Statistics Calculated for the Albacore Fishery of the South Pacific 6\nHonolulu Laboratory Fishery Scientists Gather Data, Disseminate Information at 17th Hawaiian International Billfish Tournament 6\nNOAA Research Vessel, Townsend Cromwell, Scouts for Hawaii's Missing Skipjack Tuna 7\nAugust Report From the Hawaiian Skipjack Tuna Fishery 7\nJapanese Fishermen Recover Large Number of Albacore Tagged During Joint NMFS-AFRF Albacore Tagging Program 11\nHydroacoustics Cruise Conducted off Los Angeles Bight Aboard NOAA Research Vessel, David Starr Jordan 12\nLa Jolla Laboratory Scientist Consults on Larval Fish Identification at Polish Sorting Center 14\nPreliminary Stock Recruitment Model Developed for Northern 17 Anchovy\nNew Findings on Role of Swim Bladder in Northern Anchovy\nLarvae\n18\nNMFS Report on Progress of Research on Porpoise Mortality Incidental to Tuna Purse Seine Fishing for Fiscal Year 1975 Released to Public . 23\nAssessments of Food Available to Nearshore Fishes in Representative Habitats Completed\nNOAA/NMFS\n28\nSOUTHWEST FISHERIES CENTER LA JOLLA, CALIFORNIA\nHONOLULU LABORATORY LA JOLLA LABORATORY TIBURON LABORATORY\nMONTHLY REPORT - AUGUST 1975\nSTATUS OF PUBLICATIONS\nPublished\nHobson, Edmund S. 1975. Marine animals hazardous to divers. In The NOAA Diving Manual, Chapter 15. Department of Commerce, 15-1 to 15-17.\nThis is an account of the marine organisms that are poten- tial hazards to divers during NOAA operations.\nKiefer, Dale A., and Reuben Lasker. 1975. Two blooms of Gymno- dinium splendens, an unarmored dinoflagellate. Fish. Bull., U.S. 73(3): 675-678.\nThis note reports upon two field studies of blooms of G. splen- dens, one in Coyote Bay of Bahia Concepcion, Gulf of California and the second in coastal waters of the Southern California Bight. In both occurrences G. splendens dominated the phyto- plankton crop so that measurements of primary production and the chemical composition of suspended particles allowed a reasonable description of this species.\nLasker, Reuben. 1975. Field criteria for survival of anchovy larvae: The relation between inshore chlorophyll maximum layers and successful first feeding. Fish. Bull., U.S. 73(3) : 453-462.\nNorthern anchovy larvae, Engraulis mordax, produced by labora- tory-spawned fish, have been used to detect concentrations of larval fish food in situ along the California coast. First- feeding larval anchovies, whose development was controlled by\n2\ntemperature manipulation aboard ship, were placed in samples of Los Angeles Bight water taken from the surface and from chlorophyll maximum layers. Feeding by larvae in water from the surface was minimal in all experiments but extensive feed- ing occurred in water from the chlorophyll maximum layers when these contained phytoplankters having minimum diameters of ap- proximately 40 um and which occurred in densities of 20 to 40 particles/ml. In March and April 1974, the chlorophyll maximum layer along the California coast from Malibu to San Onofre (a distance of about 100 km) consisted chiefly of a bloom of the naked dinoflagellate Gymnodinium splendens, a food organism known to support growth in anchovy larvae. Copepod nauplii and nonliving particles were never in high enough concentration or of the proper size to be eaten by the larvae. A storm which caused extensive mixing of the top 20 m of water obliterated the chlorophyll maximum layer and effectively destroyed this feeding ground of the larval anchovy.\nOtsu, Tamio. 1975. Results of tuna live bait transporting experi- ments of the Honolulu Laboratory (Honolulu Suisan Kenkyusho no saozuri ikie yuso shiken kekka). [In Jap.] Proceedings, 1974 Tuna Research Conference, Shimizu, Japan, February 4-6, 1975. Fisheries Agency, Far Seas Fisheries Research Laboratory, p. 239-243.\nYong, Marian Y. Y., and Robert A. Skillman. 1975. A computer pro- gram for analysis of polymodal frequency distributions (ENORMSEP), FORTRAN IV. Fish. Bull., U.S. 73:681.\nProgram ENORMSEP (Extended Normal Separator Program) separates a polymodal frequency distribution into its component groups where aging studies have not been performed. It calculates preliminary estimates of the number of size groups and their points of over- lap using probit analysis and polynomial regression techniques. A description of the program, with input and output for two examples, is available from the authors.\nApproved by Center Director\n\"Magnitude and ecological implications of thermal inertia in skip- jack tuna, Katsuwonus pelamis (Linnaeus)\" by William H. Neill, Randolph K. C. Chang, and Andrew E. Dizon. For publication in J. Exp. Mar. Biol. Ecol. (Netherlands).\n\"Monitoring the ocean environment\" by L. E. Eber. For publication in Mar. Fish. Rev.\n\"Anglers' Guide to the United States Pacific Coast\" by James L. Squire and Susan E. Smith. NMFS Special Publication.\n3\nHONOLULU LABORATORY\nFISH ENVIRONMENT INVESTIGATIONS\nThe objective of the Honolulu Laboratory's Experimental Ecology of Tunas group is to measure directly the responses of tunas to environ- mental factors in order to realize a long-term goal of a predictive model of tuna habitat, distribution, and availability. During August, work has proceeded on experiments to measure or determine: 1) rates of heat exchange in yellowfin tuna, 2) the effectiveness of various natural odorants and odor constituents as stimulants to tunas, 3) feed- ing periodicity and maximum daily consumption of tunas, and 4) routine respiration rates of tunas.\nRates of Heat Exchange Tested in Seven Yellowfin Tuna\nMr. Minato Yasui, a graduate student from Tokai University, has tested seven yellowfin tuna to determine rates of temperature change and excess body temperatures. The results, contrasted with skipjack tuna, are as follows: 1) rates of temperature change were not marked- ly different from skipjack tuna of similar size, but 2) yellowfin tuna warmed more rapidly than they cooled by a factor of about 2. Skipjack tuna have resistances to heating or cooling that are the same. The difference between the two species may result from different tempera- ture coefficients for metabolic rate. Skipjack tuna have Q10's for routine metabolic rate near unity; yellowfin tuna have Q10's for meta- bolic rate probably between 2 and 3, which is comparable to that of other fish. As body temperature increases so does metabolic rate; the increased metabolic rate then contributes to faster rates of warm- ing. 3) However, no evidence of a relationship between excess tempera- ture of the red muscle and water temperature was discovered. Increased metabolic rate should result in a larger temperature excess. Perhaps the positive relationship between excess temperature and water tempera- ture was obscured by variability in the data.\nResearch Assistant Reports on Responses of Tunas to Olfactory Cues\nMr. Walter Ikehara, Research Assistant with the Hawaii Institute of Marine Biology, University of Hawaii, reports that various solutions of amino acids and derivatives have been made and are currently being tested on captive tunas. To date, glycine, hyproxy-proline, and tri- methyl amine HCl have not proven to be as effective a stimulus as natu- ral fish extracts. Cine-photographic analysis of the experiments will\n4\nperhaps reveal more subtle distinctions. Work on responses of tunas to olfactory cues will continue until the end of the calendar year.\nFeeding Periodicities and Maximum Daily Consumption of Tunas Monitored\nA small, mixed species school was used by Ms. Sherry Steffel to determine maximum daily consumption. Thawed smelt were cut in ~4-g pieces (3.5 to 4.9) and presented individually to the fish in the tank. The intake of each fish was monitored. Feeding schedules used were:\n1) One feeding to satiation/day, at 0900 (n = 5 days).\n2) One feeding to satiation/day, at 1300 (n = 5 days).\n3) One feeding to satiation/day, at 1600 (n = 5 days).\n4) Continuous feeding (food was actually presented at 15 min. intervals, and fish were fed to satiation each time) (n = 10 days).\nPreliminary results are as follows in table:\nFeeding\nFish\n0900\nPercent body wt\n1300\nPercent body wt\n1600\nPercent body wt\nContinuous feeding\nPercent Body wt\nYellowfin 2.701 kg 52.2 cm\n183.7 g\n6.8\n200.0 g\n7.4\n220.0 g\n8.0\n~380 g\n14\nKawakawa 1.852 kg 45.9 cm\n132.9 g\n7.0\n119.3 g\n6.4\n115.2 g\n6.2\n~240 g\n13\nSkipjack 2.028 kg 49.0 cm\n--\n-\n--\n-\n119.5 g\n6.0\n~425 g\n21\nSkipjack 1.599 kg 45.0 cm\n163.8 g\n10.2\n121.6 g\n7.6\n119.5 g\n7.5\n~320 g\n20\nFish did not begin feeding until dawn (0600 to 0615); fish usually stopped eating after dusk, and no fish ever accepted food after 1930. The values for percent body weight per day during continuous feeding indicate consistent performance, although values did range as high as 41% body weight per day on isolated occasions. The experiments utilizing\n5\none feeding to satiation per day indicate the maximum capacity of the stomach ranges from 6 to 10% of body weight.\nAt this time two additional mixed schools are undergoing feeding activity analysis. The second school has been tested at one feeding per day (0900 or 1600) and two feedings per day (0900 and 1300) and is currently receiving continuous food. The 0900 and 1300, 4-hour feeding regime was chosen because it has been previously determined that skip- jack tuna empty their stomachs by 50% in the first 4 hours after a meal. Therefore, food consumption when stomachs were empty (0900) and 50% full (1300) was of interest. The third school of fish is currently being moved to one feeding per day.\nRoutine Respiration Rates Determined for Tunas Other Than Skipjack Tuna\nAfter use in the preceding feeding experiment, fish were starved for 24 hours and individually tested by Mr. Thomas Byles to determine respiration rates. Values obtained for the yellowfin tuna were 0.584, 0.474, and 0.500 mg 02 g-1 hr-1 for three different replications; for the kawakawa were 0.865 and 1.078 mg 02 g-1 hr-1; and for a second kawakawa (47.0, 2.472 kg) were 0.539, 0.572, and 0.571 mg 02 g-1 hr-1. Elevation of respiration rate of the first kawakawa was probably caused by allowing oxygen levels to fall too low during the test. With skip- jack tuna, oxygen levels below about 4 ppm result in very increased activity levels which would elevate consumption rate.\nBehavioral Thermoregulation Tank, Which Will Measure Temperature Preference of Tunas, Nears Completion\nProgress has been made towards a fully operational behavioral thermo- regulation tank. The fiberglass box that holds the 24, 7.5 KVA heaters has now been encased in concrete, 6 inches thick. Mr. Randolph Chang did the masonry work. The box now withstands more than the necessary 15 psi pressure. Besides calibration of the system, all that remains is wiring of the heaters.\n* *\nThe rough draft of a manuscript, \"Swimming speed as a function of temperature in three species of tunas\" by A. E. Dizon and W. H. Neill has been completed and is undergoing revisions. Some of the results of the latter paper will be presented at the upcoming American Fisheries Society meeting by the senior author.\n6\nHonolulu Laboratory Fishery Scientists Gather Data, Disseminate Information at 17th Hawaiian International Billfish Tournament\nThe 17th Hawaiian International Billfish Tournament was held in Kailua-Kona, Hawaii August 2 through 10. NMFS Fishery Biologist Heeny Yuen and Research Assistant Ray Sumida were in attendance. Mr. Yuen, ably assisted by Mr. Sumida, collected data on catch and effort in tournament areas; collected data on length, weight, and stomach con- tents; set up a NMFS display; participated in a seminar; and answered questions of tournament participants and followers.\nTUNA ASSESSMENT AND DEVELOPMENT INVESTIGATIONS\nFishery Statistics Calculated for the Albacore Fishery of the South Pacific\nDr. Robert Skillman, Leader of the Tuna Monitoring and Assessment Task, at the Honolulu Laboratory, completed the calculation of certain fishery statistics based on the generalized production model for the albacore fishery in the South Pacific. The calculation assumes that fishing would take place at the point of maximum sustainable yield and that the fleet would not materially change some of its operational char- acteristics, e.g., size of vessel, area of operations, and concentration on albacore. The fleet based in American Samoa would also continue to take 60% of the catch, as they have done in the past 10 years of the fishery.\nSpecifically, it was estimated that 199 vessels could operate out of American Samoa, 112 out of other bases in the South Pacific, and 68 as Japanese sashimi-fishing vessels in the South Pacific annually. The American Samoa-based segment of the albacore fishing vessels could catch 0.55 MT (metric ton) of albacore per day and could spend 25,100 days fish- ing out of a total of 38,100 days out from port. These vessels could make a total of 546 trips per year. In the 69.8 days out from port per trip, they could spend 46.0 days fishing.\nProgress Reported in Work on \"Status\" Reports\nWork is continuing at the Honolulu Laboratory on the \"status\" re- ports being prepared for the FAO Working Party on Small Tunas and Related Species. Fishery Biologist Howard Yoshida completed the rough draft of a report entitled \"The biology and resources of the bonitos, genus Sarda.\" Fishery Biologist Richard Uchida continued working on a manuscript\n7\ndescribing the status of research done on the biology, systematics, distribution, and fisheries for frigate mackerels, Auxis thazard and A. rochei, on a worldwide basis.\nTownsend Cromwell Scouts for Hawaii's Missing Skipjack Tuna\nNOAA ship Townsend Cromwell departed Honolulu on August 19 to scout for skipjack tuna around the Hawaiian Islands, carrying a load of threadfin shad to use as tuna bait. Skipjack, or \"aku,\" have been unusually scarce in the local fishery this season because the large fish that make up the biggest part of the summer catches have failed to make an appearance. In the course of the local scouting cruise, Cromwell delivered 18 buckets of shad to the commercial fishing boat Corsair in Hilo. Using the shad and three to four buckets of nehu, Corsair caught 6,000 pounds of skipjack tuna from a large school of 3 to 4-pound fish. Corsair captain Mr. Chaco Yamamoto reported that the shad worked very well as baitfish, although the biting of small skipjack tuna fished with shad was \"rough.\" Like other fishermen, Mr. Yamamoto indicated that the shad should work very well with large skip- jack tuna.\nTownsend Cromwell also transported 18 large milkfish from the historic Hawaiian fish ponds at Puako, Hawaii to Honolulu for experi- ments at the Oceanic Institute.\nDuring the period July 26 to August 29, Government of American Samoa employee Pulou Niuatoa recorded the lengths of. 1,212 albacore from 29 fishing vessels unloading in Pago Pago. He also collected 32 sets of catch and effort data. Utilizing data from five vessels, an average size of 90.1 cm was determined and an albacore catch per 100 hooks of 1.47.\nAugust Report From the Hawaiian Skipjack Tuna Fishery\nThe August 1975 catch of skipjack tuna in the Hawaiian fishery was an estimated 243.6 MT. This was 198.8 MT below the catch for August 1974 and 474.6 MT below the August average for 1948-74. The catch from Janu- ary through August was estimated at 1,728.5 MT, 980.0 MT below last year's batch for the same period and 1,712.0 MT below the long-term average.\n8\nLA JOLLA LABORATORY\nCoastal Fisheries Resources Division\nALBACORE FISHERIES\nEstimates of Standardized CPUE For the Entire Range Of Albacore Fishery Available For First Time In Planned Paper\nDr. R. Michael Laurs, Leader of the Albacore Fisheries Program, incorporated comments by reviewers and completed a draft of a manu- script on catch-per-unit effort of albacore tuna caught by U.S. jig vessels during 1961 to 1970. This paper will be published collab- oratively with albacore fishery scientists from the Pacific Coast States. Catch-per-unit effort data by time-area strata are presented for the albacore tuna fishery off the west coast of North America. The basic data used was collected by individual States and then merged and standardized. The results are unique in that they make available for the first time estimates of standardized catch-per-unit effort for the entire range of the fishery.\nDr. Laurs also worked on a manuscript which he and Mr. Lynn plan to publish on the offshore distribution and relative abundance of alba- core tuna and the migration pattern that albacore follow into North American waters. Mr. Ron Dotson, Biological Technician, worked on a manuscript concerning estimation of minimum swimming speed of albacore tuna based on a model developed by Magnuson (1970). He revised an earlier draft of the manuscript incorporating density calculations for albacore based on measurements of freshly caught fish. Other activi- ties conducted during August by members of the Albacore Fisheries Pro- gram included work on scientific manuscripts, preparation of presenta- tions for the Pacific Science Congress, processing of oceanographic and fishery data, and issuing albacore prediction/advisory services.\nScientists Present Invited Paper At 13th Pacific Science Congress in Vancouver, B.C.\nDr. Laurs and Mr. R. Lynn, Oceanographer at the La Jolla Labora- tory, presented papers at the 13th Pacific Science Congress held in Vancouver, B.C. Canada, during August. Both scientists were invited to make presentations at a Symposium on climatic change in the north- eastern Pacific Ocean, jointly sponsored by the Congress and the East- ern Pacific Oceanic Conference (EPOC).\n9\nDr. Laurs presented a paper entitled \"Variations in the distri- bution and availability of albacore tuna in the eastern North Pacific and marine environmental influences.\" Geographical variations in the distribution and availability of albacore in the eastern North Pacific Ocean as indicated by shifts in the location of the fishery which takes place in waters off North America were discussed. Evidence was pre- sented linking the observed variations in the distribution and avail- ability of albacore with variations in the marine environment. Based on recent research findings, Dr. Laurs concluded 1) that the migration route which albacore follow into the waters off North America is linked to the oceanic boundary structure associated with the Transition Zone between north and central Pacific waters, and 2) that variations in the location and development of the boundaries of the Transition Zone waters in offshore waters influence the distribution and availability of alba- core in near shore waters.\nMr. Lynn presented a paper entitled, \"On the year-to-year differences in the characteristics of the California Current.\" This paper was co- authored with Professor J. L. Reid, Director of Marine Life Research, SIO. Lynn and Reid noted that the annual variation of steric height is coherent and smooth over the CalCOFI of the California Current area. The monthly means, available in an atlas, show the tendencies for sea- sonal changes in the strength of the geostrophic flow and in the eddies and counterflows. From the steric height in any month, the mean can be subtracted to produce an anomaly which can be viewed as the difference of geostrophic flow of a particular month from the seasonal mean. When the nonseasonal variation in steric height is large, it can produce generally coherent patterns over the region. In January 1958, for example, this anomaly field has a cyclonic pattern centered about 200 to 300 km off Baja California, which indicates a stronger-than-average southward flow offshore and a stronger counterflow near shore.\nThe large coherent patterns in the geostrophic flow differences were shown to be reflected in the 10-m temperature anomaly patterns. Where there were large regions of above normal temperature there was above normal steric height. In that steric height is the integration of a quantity that increases with increased temperature this result suggests that the temperature anomalies extend to considerable depth. This was confirmed in an examination of the vertical distributions of temperature and salinity anomalies along CalCOFI line 90. In sectional plots for December 1957 the anomalies between 100 and 200 m within the southern California Bight show a simple mass redistribution that is ex- pected with the greater-than-normal flow found. However, about 100 m anomalies can only be accounted for by advection. Further investigation is needed to determine whether the examples studied are representative of the CalCOFI data record and to find whether generalizations can be made in regard to the interplay of the various anomaly fields.\n10\nCalCOFI Hydrographic Data Analyzed\nIn the analyses of hydrographic data for a presentation at the Pacific Science Congress, Ronald Lynn, Oceanographer outlined some requirements for processing a portion of the CalCOFI hydrographic data files. The requirements included monthly averages of tempera- ture and salinity at standard depths along CalCOFI station line 90, and the individual departures from these averages. Dr. Paul Smith, Leader of the Ecology of California Current Program and Lawrence Eber, Oceanographer, agreed that these requirements were a convenient and reasonable first trial in the organization and use of the CalCOFI hydrographic data files. Nancy Wiley, Computer Programmer, refor- mulated and corrected a series of CalCOFI data tapes to provide an efficient and readable data file. Eber accomplished the programming in a generalized format to accommodate future requirements for hydro- graphic data processing. Standard deviations and average dates for each monthly average was computed. A low-pass filter was applied to the monthly averages. Eber adopted the output to his EDMAP plotting/ contouring program to produce plots for 0 to 600 m and expanded plots of 0 to 150 m. The contour plot program was run for monthly averages and the anomalies for the cruise selected by Lynn. Lynn analyzed these results for inclusion in his presentation in the Pacific Science Congress.\nAlbacore-Oceanography Cruise and Data Processing Started\nDuring August, processing of the data for Cromwell Cruise 65, Alba- core Oceanography Cruise was begun under the direction of Ronald Lynn. Messrs. Ken Bliss and Ron Dotson corrected thermometer readings, con- verted conductivity readings to salinities and plotted calibration curves for the STD stations. Bliss made repeated attempts to process the STD tapes but found that only 4 out of 63 stations had recorded. This necessitates that the STD analog traces be digitized by hand. Mr. T. Mulitauaopele, Fishery Biologist, worked with Mr. 0. Burris, Computer Programmer, to streamline and document the system developed at the La Jolla Laboratory to accommodate albacore catch and effort data received from the Pacific coast states to generate standardized catch-per-unit estimates for the U.S. albacore fishery. Some new com- puter programs were written and others were altered, merged, or dropped to make the system more efficient and easier to use. Catch-per-unit effort estimates for the 1973 jig fishery were generated.\nCooperative NMFS-AFRF Albacore Field Studies Continue\nSince mid-July, three jigboats on charter to the American Fishermen's Research Foundation (AFRF) and in cooperation with NMFS La Jolla Laboratory\n11\nhave been scouting and tagging albacore in the near shore waters from Guadalupe Island to the southern tip of Queen Charlotte Islands. Bio- logical technicians from the SWFC are on board two of these vessels to tag albacore, gather oceanographic and meteorological data, and collect biological samples.\nEach of the three chartered vessels is scheduled for three, 25-day cruises. All are reporting daily catch and weather information to the AFRF and subsurface temperature BATHY reports to NMFS radio station WWD. The information received is transmitted to other fishermen and interested persons by the fishing fleet and AFRF through ship-to-ship and ship-to- shore radio transmissions and by the La Jolla Laboratory through the daily Albacore Fishery Information radio broadcasts prepared by Mr. Nishimoto, Fishery Biologist. These reports are helpful in reducing search-time for albacore concentrations and planning of fishing tac- tics. Weather observations and BATHY reports are also relayed to Navy Fleet Numerical Weather Central in Monterey and the weather observations to NWS.\nAlong with the collection of fishery and oceanographic data, an estimated 450 albacore have been tagged and released by the AFRF char- ter vessels. The joint NMFS-AFRF tagging program is being conducted to study movements of albacore along the North American coast and associated oceanographic factors.\nJapanese Fishermen Recover Large Number of Albacore Tagged During Joint NMFS-AFRF Albacore Tagging Program\nDr. Laurs reports that 37 recoveries were made in 1975 by Japanese albacore tuna fishermen in the western North Pacific of albacore tagged and released in the eastern North Pacific during the joint NMFS-AFRF albacore tagging program. Of these recoveries, 36 were taken on live bait fishing vessels and 1 on a longline. A total of 64 tagged alba- core which were tagged during the joint NMFS-AFRF tagging program have been recovered by Japanese and Korean fishermen, 58 caught on Japanese live bait vessels, 5 on Japanese longline vessels and 1 on a Korean long- line vessel. The results from the tag recoveries provide new information on the 1) seasonal development and distribution of the Japanese live bait fishery, 2) location and character of the migration of fish out of the live bait fishery, and 3) movements of albacore among the North American, Japanese live bait, and Japanese longline fisheries.\nThe tag returns indicate 1) that during the early portion of the Japanese live bait fishery in March-April, the fish are distributed generally over a broad latitudinal range, roughly 28° to 40º N, within a few hundred miles of the Japanese Islands; 2) as the season advances the fish move eastward in a progressively contracting latitudinal band; and 3) near the end of the live bait fishery in June, the fish appear\n12\nto follow a narrow, well-defined emigration route extending over only a couple degrees of latitude and centered in the Emporer Seamount area at about 35º N, 171º W. The latter conclusion is based on the recovery of 29 tagged fish within very close proximity of each other in the vi- cinity of the Emporer Seamount within a 3 week period in June 1975, and the recovery of 14 tagged fish in the same area during a 12-day period in mid-June 1974. One of the tagged fish which was captured in June 1975 near the Emporer Seamount was tagged 21 days earlier by a U.S. jig vessel conducting exploratory fishing in the western North Pacific in cooperation with the La Jolla Laboratory (see April SWFC Monthly Re- port). The fish was tagged 400+ miles WSW from where it was recovered. Assuming a straightline movement and that the fish was caught immediate- ly upon entering the location where it was recovered, the fish moved eastward at slightly over 20 miles per day.\nIt is well-established that the North Pacific population of alba- core tuna supports three main fisheries - North American surface fish- ery, Japanese live bait surface fishery, and Japanese longline subsur- face fishery - and that there are movements of fish among these fish- eries. There is disagreement in the literature, however, concerning the pattern of movement among the fisheries. According to some inves- tigators the albacore move from the U.S. fishery mainly to the Japanese longline fishery and then to the Japanese live bait fishery, with some exchange from both of the Japanese fisheries back to the U.S. fishery. Another hypothesis is that fish upon leaving the U.S. fishery mainly enter the Japanese live bait fishery and then the Japanese longline fishery. Results from the joint NMFS-AFRF tagging program conclusively demonstrate that the latter hypothesis is correct. Ninety-two percent of the tagged albacore recovered by the Japanese have been from live bait fishing vessels and the majority of these recoveries were made during the first Japanese live bait fishing season following release of the fish.\nECOLOGY OF THE CALIFORNIA CURRENT\nHydroacoustics Cruise Conducted off the Los Angeles Bight Aboard NOAA Research Vessel, Jordan\nDr. Paul Smith, Fishery Biologist at the La Jolla Laboratory, headed a group of scientists who conducted a hydroacoustics cruise off the Los Angeles Bight aboard the NOAA research vessel, David Starr Jordan, August 5 to 15. The objectives of the cruise were to obtain direct (camera) and indirect (acoustic) measures of anchovy school compactions, obtain aerial photographs of anchovy schools, vertical high frequency acoustic measurements of volume reverberation and sound\n13\nvelocity profiles (STDO). The cruise also served as a training exer- cise in the use of CalCOFI bongo net tows for personnel from the In- stituto Nacional de Pesca (INP), Mexico City and the Pacific Marine Environmental Laboratory (PMEL), Seattle, Washington.\nAccording to Dr. Smith, anchovy schools were approached and in- sonified using the 11 kHz and 30 kHz scientific sonars on the Jordan. A skiff was directed onto the schools using the ship's sonar, radar and a skiff-mounted portable echo sounder. Free vehicle and tethered underwater camera drops were conducted from the skiff.\nTwo signal processing systems were in use aboard the Jordan. A NMFS-designed system using a Digital DPD 8 computer and a Navy-designed system built around a Hewlett-Packard 2100 computer. The input signal to both systems was the echo, after amplification and filtering, re- ceived by the 30 kHz sonar transducer. Echoes from 48 arbitrarily selected schools were recorded simultaneously by both systems. The Navy system also recorded acoustic information on two schools outside the observation band sampled by the NMFS system.\nUnderwater camera drops were made into 34 of the 50 schools which were acoustically interrogated. Sixteen additional drops were made on schools not recorded by either system due to range-gating limitations.\nAerial reconnaissance was conducted on 2 days previous to the cruise. Concentrations of anchovy schools were located 5 miles off the coast from Dana Point to Point Fermin; the aircraft operated during the cruise for 2 to 3 hours on each of 3 days. Low overcast and poor radio communications prohibited more extensive participation. Visual confirmation of the dimensions and shape of a school detected by sonar was accomplished. Three camera drops on separate schools were directed by an aerial observer.\nSonar mapping of fish schools was conducted on one night between 2000 and 0400 hours using the 30 kHz sonar with 10 msec pulses. Two hundred and twenty-six targets, presumed to be fish schools, were logged during the 8-hour period. Distributions of target size and target strength were compared with data taken during daylight hours. The night schools appeared, on this occasion, to be larger in size and lower in target strength than the long-term average values for daytime schools. Observations of schools during first light (beginning of nau- tical twilight) indicate a 5 decibel (3-fold) increase in average echo intensity over a period of 20 minutes. These observations suggest the existence of large, loose schools during the dark hours which fragment and form into smaller, more compact schools as dawn approaches.\nIn addition to the work described above, neuston tows, Isaacs-Kidd midwater trawls and 4 to 15 m midwater trawls were made off the coast at Dana Point, in Santa Monica Bay, and southeast of the Santa Catalina\n14\nIslands. While the cruise was successful in locating schools of adult anchovy for study, the young-of-the-year were not as adequate- ly sampled as anticipated. Additional anchovy fry, for otolith aging, will be obtained from various bait haulers in southern California and from blanket net samples taken on the sea survey cruises of the Cali- fornia Department of Fish and Game.\nLowest Sea Temperatures Recorded at Scripps Pier\nDick Evans, Oceanographer at the La Jolla Laboratory, reports that on August 5, 1975 the water temperature at Scripps Pier dipped to 57º F (13.9º C). This was 0.2º F below the previous low temperature recorded for August in the 68 years that water temperature records have been kept for Scripps Pier. Dr. Paul Smith of the La Jolla Laboratory was on board the R/V David Starr Jordan during this period and he undertook to docu- ment this phenomenon by conducting an XBT transect from Scripps Pier off- shore. The profile of water temperature from the XBT transect extended in a southwesterly direction for about 100 miles from Scripps Pier. Since the water temperature at Scripps Pier had warmed to 65º F (18.3º C) by August 7, the conditions that existed on August 5, were no longer in evidence on August 15 when the XBT transect was conducted.\nIn spite of this the XBT data does indicate the reason for the cold water intrusion. The temperature profile shows that a very shallow (5 m) and sharp (4º C/5 m) thermocline existed in the nearshore region. The thermocline became deeper and weaker with increasing distance from the shore till it reached a depth of some 25 m in the offshore area. It is clear from the section that only a very small northerly component of sur- face wind would have been necessary under these circumstances to cause the upwelling of colder waters into the surface nearshore zone. This condition may have been enhanced by the mixing of deeper waters from coastal offshore canyons into the surface layer by tidal action, in consideration of the fact that large spring tides were occurring around August 5.\nMARINE ENVIRONMENTAL ASSESSMENT\nLa Jolla Laboratory Scientist Consults on Larval Fish Identification at Polish Sorting Center\nDuring the last 2 weeks in August, Dr. E. Ahlstrom, Senior Scientist at the La Jolla Laboratory, visited the Ichthyoplankton Sorting Center at Szczecin, Poland, to advise and instruct the staff on identification of fish eggs and larvae. The sorting center has a staff of 25 persons, 21 of whom are working on sorting and identification of fish eggs and larvae\n15\nand other constituents from plankton collections. About one-half of the persons on the staff are graduates of the school of fisheries, which is located in an adjacent building.\nThree Polish scientists attended Dr. Ahlstrom's 4-week course dealing with identification of fish eggs and larvae given at the La Jolla Laboratory in March and April of this year; two of these were from the sorting center. Hence, the purpose of the visit was to aid workers in \"problem areas\" with regard to identification of fish eggs and larvae, as well as check on how well they were identifying their material and to determine what was needed to facilitate and improve their identification of fish larvae.\nAs a consequence of his evaluation of the situation at the sorting center, Dr. Ahlstrom recommended a three-pronged approach to aid work- ers in identification. Firstly, there is no comprehensive list of the fishes that could occur as eggs and larvae in their samples; inasmuch as fish larvae have to be tied to adults, their correct identification requires an informed background on juvenile and adult character. Larvae identifications are greatly dependent upon countable structures such as myomeres or vertebrae, fin ray counts, often gillraker counts, etc. - and such meristics are needed for all adults that spawn within the sur- vey area. First priority therefore, according to Dr. Ahlstrom, should be given to working up a list of the fishes that could occur and what their meristic characters are. Secondly, the workers need to know for which species the life history series are known, and for which species they are not known. Furthermore, handbooks should be compiled of the known series. Thirdly, a better reference library is badly needed. Considerable effort should be expended in getting together a basic reference library on fish eggs and larvae and on the taxonomy of adults.\nDr. Ahlstrom observed that several of the workers are making good progress in identification of fish larvae. Several of the more pro- mising workers could become \"specialists\" in particular groups of fishes - such as the gadoids, clupeoids, flatfishes, scorpaenids - and be respon- sible for checking out identifications of the other workers.\nOn his way to Poland, Dr. Ahlstrom visited the Museum of the Uni- versity of Copenhagen, to study material relevant to two manuscripts that are currently being completed - one dealing with scorpaenids life histories, the other with stromateoid life histories. Dr. Ahlstrom examined several collections of specimens of particular relevance to these studies; several of the collections will be sent to La Jolla for further study.\nThe \"Identification guide to larvae of eastern Pacific scorpion- fishes\" has now been typed and is being prepared for outside review.\nDrs. E. Ahlstrom and G. Moser of the La Jolla Laboratory are collaborating with Mr. M. O'Toole of the University of Cape Town,\n16\nSouth Africa, on a life history study of the commercial lanternfishes, Lampanytodes hectoris, abundant in the waters off South Africa. A manuscript is being prepared for inclusion in a special publication of the Los Angeles County Museum of Natural History honoring Dr. Carl Hubbs, Professor Emeritus of Biology at UCSD, and one of the world's most renowned ichthyologists.\nMs. Elaine Carlin has almost completed her analysis of the meristics of the fishes of Magdalena Bay, Baja California, and will begin a manu- script of this study before returning to Humboldt State University this fall.\nThe three authors, Dr. Ahlstrom, Mr. John Butler, and Ms. Barbara Sumida, of the manuscript dealing with \"Pelagic stromateoid fishes of the eastern Pacific, kind, distributions, and early life histories\" are busy editing the text, and striving for consistency in presentation of the information in life history series.\nRECREATIONAL FISHERIES\nAnchovy Research Documents Prepared for U.S. - Mexican Meeting\nMr. A. MacCall, CF&G Marine Biologist assigned to the La Jolla Laboratory of the SWFC, assembled a variety of documents describing the anchovy research programs in California to date. These documents were gathered in preparation for the September 26 meeting between CalCOFI and the Instituto Nacional de Pesca of Mexico. The documents include 1) a list and location of available data, with samples, 2) des- criptions of data collection, processing and display, including computer programs for fisheries statistics, and 3) a list and description of current fisheries models.\n*\nMr. MacCall and Dr. G. Stauffer, SWFC Fishery Biologist, initiated the planning of the upcoming CalCOFI Symposium entitled, \"The anchovy management challenge.\" The CalCOFI Conference will be held December 9-11 on the UCSD campus in La Jolla. The Symposium will include an organized presentation of materials previously discussed in CalCOFI anchovy work- shops, and presentations by California and Mexican government represen- tatives on the policy and politics of the management of the anchovy fisheries especially with regard to expansion of Mexico's fishery. To round out the program, scientists will be invited to speak on parallel fishery experiences in South Africa and Peru.\n17\nPreliminary Stock Recruitment Model for Northern Anchovy Developed\nMr. MacCall and Dr. Stauffer this month developed a preliminary stock recruitment model for the northern anchovy population from avail- able abundance estimates based on the larva index for years 1950 to 1966. Recruitment to the spawning biomass for a given year was esti- mated from the larva index of that year minus the index of the previous year x 0.44, the average resulting change in spawning biomass after a year of growth and natural mortality. The scatter of data points is typical of stock recruitment relationships although it appears that a Ricker-type curve fits the data. The analysis indicates that recruit- ment to the spawning biomass was exceptional in 1962, 1963, and 1965. If anchovies spawn after 1 year, then one could conclude that conditions for recruitment were better than average in 1961, 1962, and 1964.\nData on Growth and Mortality of Northern Anchovy Stocks Reviewed\nMr. J. MacGregor, Fishery Biologist in the Recreational Fisheries Program at the La Jolla Laboratory, reviewed, and in some cases, reanalyzed data on growth and mortality of the northern anchovy stocks. The first step in applying fishery management models to the anchovy stocks is to compile, standardize, and analyze existing data. Such an inventory of available data not only provides better statistics, but also indicates what data should be collected in the future. The pri- mary purpose of the review at this time is to evaluate the application of yield-per-recruit model to the anchovy stock in light of the expanding Mexican reduction fishery. A working paper is being pre- pared for the Fourth Anchovy Workshop scheduled for January 1976 at the SWFC.\nMr. MacGregor also completed the final revisions on a paper entitled \"Ovarian development and fecundity of five species of California Current fishes.\" The paper, scheduled for publication in CalCOFI Reports, Vol. 18, was returned to the editor.\nSTOCK AND RECRUITMENT\nEnvironmental Studies of the Larval Anchovy's Feeding Regime Summarized\nEarly this month Dr. R. Lasker, Chief of the Coastal Fisheries Resources Division at the La Jolla Laboratory, met with scientists at the Brookhaven National Laboratory to discuss the future of the larval\n18\nfish mortality program in the New York Bight. Plans to continue the study for a second year were agreed upon with increased participation by the Narragansett Larval Fish Laboratory of the Northeast Fisheries Center and the Sandy Hook Laboratory of the Middle Atlantic Coastal Fisheries Center. Plans have been made for Dr. E. Scura and Ms. Dorsey to join the Delaware II in November and to test summer flounder larvae in natural sea water. Similarly, a cruise aboard the R/V Eastward is planned for April 1976, in which studies on yellowtail flounder larvae will be done.\nOn August 19, Dr. Lasker gave a talk in Vancouver, B.C. to the Pacific Science Congress's first session on aquatic sciences entitled \"Energy transformation in the pelagic community as related to studies on fish survival and fisheries management\" which encompassed his and Dr. Smith's latest ideas on stock and recruitment analysis from studies in the Los Angeles Bight and the California Current. In preparation for his part of this talk, Dr. Lasker prepared an Administrative Report (LJ-75-60) entitled \"Environmental studies of the feeding regime of the larval anchovy in the Los Angeles Bight\" in which he showed that the advent of storm systems and turbulent mixing of the upper 100 m during the month of March 1975 diluted the larval anchovy's food organisms to a degree where there was not enough food left to sustain first-feeding larvae in their natural environment from March through April. At the Congress, Dr. Lasker predicted that the 1975 anchovy year-class should be a relatively poor one.\nAt Dr. Lasker's request, Mr. J. Brown, in preparation for the micro- stratification cruise to be undertaken in March 1976, has been developing a towed particle counter. This month Mr. Brown has built several sensor models and after testing found one that can be used with an underwater pumping system to be superior. Mr. Brown is currently investigating the use of several sensors simultaneously.\nNew Findings Made on the Role of the Swim Bladder in the Ecology of Northern Anchovy Larvae\nDr. J. Hunter, Fishery Biologist, and Ms. C. Sanchez, Physical Science Technician at the La Jolla Laboratory, continued their work this month on the role of swim bladder development in the ecology of the northern anchovy larvae. Their past research demonstrated that the initial filling of the swim bladder occurs when larvae reach about 10 mm, thereafter, larvae inflate their bladder at night and deflate the bladder during the day. More recent work indicates that larvae often are at or near neutral buoyancy at night, whereas, those cap- tured during the day sink rapidly when not swimming. Preliminary measurements of the carbon dioxide, oxygen, and nitrogen composition of the swim bladder of anchovy larvae indicates that it does not differ from atmospheric concentrations. An experiment in which the tank was\n19\nsealed at night with mineral oil showed that the bladders of larvae in the sealed tank were less inflated than those in an unsealed tank. These data suggest that inflation of the swim bladder at night is accomplished by gulping air at the surface. This conclusion is con- sistent with other findings, e.g., no histological evidence exists for gas secretion in either larval or adult anchovy (O'Connell, pers. comm. ; O'Connell, 1955), and studies of other adult clupeoids indicates that they do not secrete gas into the swim bladder. Thus it is quite possible that larval anchovy may swim to the surface at night to fill their swim bladder. This hypothesis prompted an examination of the vertical distribution data for larval anchovy collected by Ahlstrom (1959), and from Ahlstrom's unpublished data from the same study. The vertical distribution of anchovy is summarized below for all of his collections combined. In the night collections one station (5504- 120.50) had many more larvae than the rest but if it is deleted the trends remain essentially unchanged.\nExamination of the table suggests that the larger larvae may mi- grate vertically, swimming to the surface waters at night. The data for larger larvae captured in the day is based on only 14 larvae so this still remains speculative.\nVertical distribution of anchovy larvae (from Ahlstrom, 1959, and unpublished data).\nPercent\nPercent\nDepth m\nLarvae Day\n< 11.75 mm Night\nLarvae Day\n≥ 11.75 mm Night\n2\n2.1\n26.6\n0\n38.4\n8\n42.7\n28.3\n7.0\n27.2\n19\n5.1\n16.3\n7.0\n13.6\n28\n45.0\n8.1\n28.6\n16.8\n41\n4.5\n12.1\n21.4\n2.9\n56\n1.5\n7.6\n28.6\n1.1\n72\n0\n1.1\n7.0\n0\n88\n0\n.1\n0\n0\n105\n0\n0\n0\n0\nTotal Number Larvae\n331\n6,456\n14\n279\nNumber of Stations\n8\n5\n7\n5\n20\n* * *\nDr. Angeles Alvariño worked this month on a draft of a manuscript which reviews the incidence of predation by planktonic predators on marine fish larvae. Tables of the food of species of medusae and Ctenophora have been prepared. About 75% of the literature deals with the predatory activities of medusae. The food of 50 species have been studied and about 75% of these were reported to feed on marine fish larvae. The observations of various investigators suggest that when fish larvae are present they are preferred over any other zooplankter. Medusae also fed on planktonic organisms which constitute the food of fish larvae and, therefore, should also be considered potential com- petitors as well as predators. Predatory activity of Ctenophora is recorded in 36 publications. In 11 species, the food has been analyzed and of these more than 50% fed on fish larvae, young fish, and fish eggs as well as zooplankton.\n* * *\nA paper by Dr. Ann Hurley, former NOAA Fellow at the La Jolla Lab- oratory, entitled \"Feeding behavior, food consumption, growth and res- piration of squid (Loligo opalescens) raised in the laboratory\" has been accepted for publication in the Fishery Bulletin, U.S.\nThe squid Loligo opalescens was raised by Dr. Hurley in the labora- tory to a maximum age of 100 days on a diet of Artemia nauplii and adults. She found that newly hatched squid (2.7 mm mantle length) readily attack- ed Artemia nauplii (length 0.7 mm), Artemia adults (length 5 mm), copepods (length 1 mm) and larval fish (length 4 mm). Feeding rates varied between 35 and 80% of squid body weight per day. Growth rate was highly variable in different individuals, ranging from 0.5 to nearly 4.5 mm mantle length per month. Respiration rates were obtained at 15º C for squid of three different ages and at 10°, 15°, and 20º C for 1 day old squid.\nVisiting Scientist Completes Manuscript on Comparison of\nFood and Feeding in Three California Current Fishes\nDr. David K. Arthur, visiting scientist at the SWFC, has recently completed a manuscript reporting on the intestinal contents of larvae of Pacific sardine, northern anchovy and jack mackerel taken in CalCOFI samples. The taxa and size of food, diurnality of feeding and the feed- ing incidence of the larvae of these three important California Current fishes were compared.\nA curious decline in feeding incidence is common to the early larval stages of several species of the genus Engraulis is noted. This decline coincides with a lack of increase in the expected size of food particles ingested and also may be related to differences in relative body depth, i.e., the physical condition of laboratory-grown when compared with ocean-grown anchovy larvae.\n21\nDaily Rings in Anchovy Otoliths Investigated\nMr. Kramer, Fishery Biologist at the La Jolla Laboratory, has been learning and developing techniques for removing, mounting, and reading otoliths for daily growth rings from the larvae of anchovy, Pacific mackerel and jack mackerel reared in the Southwest Fisheries Center aquarium to compare with those from anchovy larvae and other fishes (larvae, juveniles, and adults) collected in the field.\nMr. Kramer discovered this month, that in addition to the sagittae, another pair of otoliths in most fishes, the asterisci, can also be read for daily rings, thus providing a check on the counts made with the sagittae. In many instances, when sagittae grow too thick for direct reading by transmitted light, the asterisci, which grow at a much slow- er rate, can still be read without resorting to grinding or etching pro- cedures.\nJuvenile anchovy could not be collected by Mr. Kramer for daily growth ring studies on the recent Jordan survey, August 5 to 15. How- ever, arrangements have been made to obtain the desired sized fish from the bait and young fish surveys conducted by California Department of Fish and Game.\n*\nDr. William Vlymen, NOAA Research Associate at the La Jolla Labora- tory, is attempting to model the anchovy larva's behavior and environ- ment using data obtained in the laboratory and at sea. Dr. Vlymen has derived a closed form expression for the recurrence times of the attack event from a Markov chain attack model. The attack rates found by the model were identical to those observed by Dr. John Hunter for 4 to 5 mm larvae feeding on high concentrations of food particles.\nAn estimation of the representative particle size distribution in the Los Angeles Bight during the peak anchovy spawning season was made from the recent Niskin bottle-Coulter Counter surveys of Dr. Richard Eppley of the Scripps Institution of Oceanography. Analysis of the data showed a remarkable fit by a hyperbolic size distribution. This type of particle size distribution has been found to be particularly ubiquitous in nature.\nThis distribution also allows calculation of a density function for particle sizes and a concomitant mean particle size for any size range. These averages are important in the model because anchovy lar- vae feed on only a certain range of the prey distribution at any time in their life. The exact range as a function of size was determined from data and literature supplied by Dr. David Arthur, visiting scien- tist at the Southwest Fisheries Center.\nIn addition to the above work, a caloric value size relation was worked out and a theoretical estimation of the larval size distribution at 2.0 cm was constructed.\n22\nDistribution of Food Organisms for Larval Fish to be Studied on Cruise in the Los Angeles Bight\nAs part of the Southwest Fisheries Center investigation of factors affecting recruitment of anchovies, Dr. E. Scura, Physiologist at the La Jolla laboratory, spent the past month preparing for a September cruise in the Los Angeles Bight. One of the objectives of the cruise is to study the distribution of food organisms for larval fish. Pre- vious cruises have located areas in the Los Angeles Bight where suffi- cient food of the proper size (30 to 50 m) is available for first feed- ing anchovy larvae. However, laboratory studies indicate that older larvae require larger food organisms in concentrations greater than 1/ml. The purpose of the September cruise is to develop methods for locating aggregations of larger food organisms.\nA Model \"A\" Coulter Counter has been modified so that it can be used in a search for aggregations of particles at sea. Some of the modifications are: 1) the standard counting chamber has been replaced with a continuous flow chamber with a 1-mm aperture. This chamber is capable of measuring particles in the 40 to 400 m size range; 2) the volume measuring switch has been replaced with an on-off switch so that the instrument can be made to count continuous rather than for a discrete volume; and 3) the electronic unit has been modified to de- tect counting rate rather than absolute counts. The instrument output was connected to a chart recorder so that small increases in counting rate appear as peaks on the recorder. The peak height is proportional to the concentration of particles in the water passing through the counting chamber.\nThe plan is to pump water through a small diameter hose which will be connected to a hydro-wire as it passes through the water column. A portion of the sample stream will be diverted through the counting cham- ber. If a patch is detected by the Coulter Counter, a sample will be taken from the hose for further investigation.\nThe surface layer is also an area where food organisms might po- tentially aggregate. To sample just the top few centimeters at the sur- face, a small volume continuous-flow surface skimmer has been developed to be used in conjunction with the Coulter Counter and will also be tested on the September cruise.\n23\nOceanic Fisheries Resources Division\nPORPOISE/TUNA\nNMFS Report on Progress of Research on Porpoise Mortality Incidental to Tuna Purse Seine Fishing for Fiscal Year 1975 Released to Public\nA comprehensive report (SWFC Administrative Report No. LJ-75-68), \"Progress of research on porpoise mortality incidental to tuna purse seine fishing for fiscal year 1975\", compiled by Dr. William Fox, Acting Chief of the Oceanic Fisheries Resources Division, and the staff of the Porpoise/Tuna Interaction program, headed by Dr. William Lenarz, was released to the public by NMFS, Washington, D.C. on August 18, 1975. This report will serve as background information on hearings in early October 1975, on consideration of the issuance of a general permit allowing the tuna industry a continued incidental take of marine mam- mals.\nAn expanded program of porpoise research was started in late 1972 at the La Jolla Laboratory as a direct result of the passage of the Marine Mammal Protection Act of 1972. The objective of the program was to develop fishing methods and gear technology which would reduce the incidental mortality of porpoises in the yellowfin tuna purse seine fishery and to determine the status of the porpoise stocks associated with the incidental mortality. As presently constituted the program to accomplish this consists of three somewhat related components: 1) mortality reduction technology, 2) general biology, ecology, and popu- lation dynamics, and 3) data management and quantitative analysis.\nThe following is a summary of information contained in this progress report.\nDuring the year, two gear research cruises were conducted to test a variety of gear and methods under charter to the NMFS. In addition, the large volume purse seine net, apron, anti-torque cable, lengthened current ribbons, and porpoise grabber received additional testing in the U.S. purse seine fleet with the cooperation, participation, and investment of members of the fleet. The resulting evaluation of the\n24\ndata from these cruises and the field technician program indicates that technological developments certain to reduce further incidental porpoise mortality are the use of speedboats, when needed, to hold the net open prior to the execution of backing down and the use of rescuers at the corkline. Technological developments that will re- quire further testing and analysis but that are promising to reduce further incidental porpoise mortality are certain design features of the large volume purse seine, finer mesh Medina panels and use of fine mesh in other areas of the nets, the porpoise apron, and the grabber.\nA major paper on the general biology of the offshore spotted dol- phin (Stenella attenuata), historically the species with the highest mortality in the eastern Pacific tropical tuna fishery was completed. The study was based on data from several thousand specimens of these porpoises and treated such matters as gestation period, fetal growth, age determination, length-weight relationships, geographical variation, etc. Biological research has since concentrated on the biology of the eastern spinner dolphin (Stenella longirostris subspecies), the species with the second highest total incidental mortality. Work on the bi- ology of the common dolphin (Delphinus species), the species with the third highest mortality, and the striped dolphin (Stenella coeruleoalba), a more rarely encountered species, is continuing. One of the more diffi- cult problems in porpoise biology, direct calibration of age, received special attention when a contract was granted to Dr. Jeffrey Bada of the University of California at San Diego, to apply his new technique to aging mammals through biochemical analysis of dental protein.\nUnder the provisions of the Marine Mammal Act of 1972, and with the cooperation of the U.S. tuna fleet, NMFS field technicians go to sea aboard U.S. tuna purse seiners, where they count porpoises killed incidentally in the fishing operations, record statistics on size and makeup of the catch, collect specimens to be used in studies of por- poise life histories and stock assessments, and make detailed observa- tions of the rescue operations during each tuna set, and make other observations on cetaceans and birds. In 1975, the field technician program, working cooperatively with the tuna industry completed 31 trips, which adequately covered the entire U.S. unregulated, yellow- fin tuna fishing season within the CYRA.\nInformation derived from the field technician program is integrated with data from an aerial survey and further treated statistically to derive an estimation of porpoise stocks. Tentative conclusions of the staff are that the stock of offshore spotted dolphins in the eastern Pacific is estimated at 3.1 to 3.5 million animals. Using data obtain- ed from the field technician program and data collected by the Inter- American Tropical Tuna Commission, the staff estimated that 72,000 offshore spotted dolphins were killed in 1974. The estimated inci- dental fishing mortality rate for 1974 is 2.1 to 2.3%. The best\n25\nestimate at present is that biologically, the population could sustain an annual fishing mortality rate of 1.4 to 4.4%. There is no striking evidence that the stock is either increasing or decreasing.\nSimilar estimates place the stock of eastern spinner dolphins in the eastern Pacific at 1.1 to 1.2 million animals and the 1974 annual rate of mortality caused by fishing at 1.8 to 1.9%. The best estimate at present is that, biologically, the population could sustain an annual incidental fishing mortality of 2.8%. As with the spotted dolphin, there is no striking evidence that the stock is either increasing or decreasing.\nUsing data from 1973, 1974, and 1975, an evaluation of the U.S. tuna fleet's kill rate performance for 1975, under conditions compar- able to previous years, was made. Tentative conclusions which were made from the analysis of these data indicated that total porpoise mortality from fishing in 1975 will probably be greater than 1974. The revised preliminary kill estimate for 1974 was 113,000 animals (98,000 by U.S. vessels). The preliminary kill estimate for 1975 is 93,000 to 214,000 animals. Using the same percentage as in 1974, the U.S. kill for 1975 will probably be 81,000 to 186,000 animals. While it appears that the kill rate will be higher in 1975 than in 1974, analysis of the data revealed that fishing conditions changed between 1974 and 1975 and that under similar conditions the kill rate in 1975 would have been 22% lower than in 1974.\nNASA Cooperation Permits Evaluation of Aircraft for Porpoise Surveys\nOn August 13, 1975, the Bering Sea Marine Mammal Experiment (BESMEX) and the Arctic Ice Dynamics Experiment (AIDEX) flew their remote sensing systems checkout mission aboard NASA's Galileo II. At the request of the National Marine Fisheries Service, Mr. James Coe, Fishery Biologist at the La Jolla Laboratory, was permitted to observe this mission in order to form opinions on the feasibility of employing Galileo II for porpoise survey work and to aid in the loca- tion and filming of a school of porpoise.\nDr. G. Carlton Ray, Principal Investigator, BESMEX was very interested in the problems of small cetacean survey and kindly agreed to a major alteration of his mission's flight plan in the event that a good target could be located. Before the flight, Mr. Coe was briefed on the mission and acquainted with problems encountered in remote sensing of animal populations in general.\nThe BESMEX segment of the mission was to consist of four east/ west passes over the Santa Barbara Channel Islands from Anacapa Island to San Miguel Island at an altitude of 3,000 feet and an air speed of 250 knots. On each of these legs, the camera systems, RC-8, KS-87, and the IR scanner would be operated over general targets (pinnipeds, kelp\n26\nbeds, land masses, hauled-out pinnipeds, birds, and whales) and if pos- sible, a large school of porpoise. If conditions permitted and a por- poise school was found, it was agreed that the school would be recorded from 3,000, 5,000, 10,000, and possibly 15,000 feet.\nUnfortunately, low stratus clouds from 1,500 to 2,500 feet pre- cluded flying the intended tracks. Instead the aircraft was led through some small openings in the cloud cover and parts of San Miguel and Santa Rosa Islands and the surrounding waters were scanned using the KS-87 camera and the IR imager. The RC-8- x 9-inch film format camera system was inoperable below 3,000 feet due to target motion. A school of about 1,000 to 2,000 Delphinus sp. were sighted about 5 miles south of San Miguel Island and four passes were made over the school from an altitude of about 1,500 feet using the motion compensated KS-87 camera and the IR imager.\nMr. Coe was subsequently informed that cursory examination of the segments of the film exposed over the porpoise school revealed nothing. This may have been because the porpoises submerged as the aircraft ap- proached or they may simply have been missed. The IR scanner tapes also showed nothing from the porpoise school either, but this may have been due to the magnitude of temperature differential which the scanner was set to detect (20° C) and that IR sensing may be a useful tool in small cetacean survey work. In summary, Mr. Coe is of the opinion that the Convair 990, specifically the Galileo II, is not suitable for visual survey work. He recommended, however, that NOAA/NMFS should now define its survey/sensing needs. Since BESMEX and NASA are cooperative and interested, it may be possible to examine NASA's extensive capabilities in this area for porpoise surveys in the future.\nTUNA RESOURCES\nPreparations Continue for ICCAT Meeting\nEach year the Standing Committee on Research and Statistics (SCRS) of the International Commission for the Conservation of Atlantic Tunas ( ICCAT) meet to evaluate the status of the Atlantic tuna stocks and to advise the Commission on scientific matters relating to the conservation of the stocks. This year the SCRS will meet during November 12-18 in Madrid, Spain. Current Chairman of the SCRS is Dr. Brian Rothschild, Director of the Southwest Fisheries Center.\nThe staff of the Tuna Stock Assessment task at the La Jolla Labora- tory, headed by Acting Leader, Dr. Gary Sakagawa, is planning to submit documents at the meeting. Members of the task continue to work on anal- yses that will be used in about 10 documents. During the past month, progress was made in the preparation of documents on size composition\n27\nof tropical tunas caught by the U.S. fleet, status of the skipjack tuna stocks, status of the bigeye tuna stocks, and size composition of yellowfin and skipjack tunas caught by all fleets in the Atlantic. Documents on the status of the yellowfin tuna stocks are scheduled for completion and submission to the SCRS.\nFirst Working Versions of Computer Data Base for Atlantic Tunas Completed\nThe first working versions of catch and length-frequency computer data bases for Atlantic tunas were completed by Mathematician A. Coan and Fishery Biologists G. Sakagawa and T. Murphy at the La Jolla Labora- tory. The catch data base contains all catches of Atlantic tunas, by country, for 1960-73. The length-frequency data base contains length frequencies of skipjack, yellowfin, and bigeye tunas by gear, month, and ocean region where catches were made. Current plans are to expand and update the data bases, and use the bases as integral components in future studies on tuna stock assessment.\nTuna Vessels Participate in FAX Program\nDuring August a total of 29 U.S. seiners participated in the FAX program of the La Jolla Laboratory. Reporting rates for August 1975 were down from August of 1974 by about 23% as shown below.\nAugust Reporting Rates\nWeather observations\nXBT observations\nTotal\n1974\n310\n87\n397\n1975\n268\n38\n306\nPercent\nChange\n-13.6%\n-56.3%\n-22.9%\nJanuary-July\n1974\n1,815\n340\n2.155\n1975\n2,221\n432\n2,653\nPercent\nChange\n+22.4%\n+27.06%\n+23.1%\n28\nMuch of the drop in reporting rate for August can be explained by the fact that more than 40 U.S. seiners returned to San Diego to protest foreign fishing inside the Commission Yellowfin Regulatory Area (CYRA). Most of these seiners are cooperating vessels that collect expendable bathythermograph and weather observations. The tuna seiner, Jeanette C, again led cooperating vessels in August with 45 weather observations sent by radio to the Southwest Fisheries Center.\nRelationship Between Fishing Success and Environmental Parameters Investigated\nIndustrial Economist D. Huppert, Oceanographer R. Evans, and Mathematical Technician K. Brennecke at the La Jolla Laboratory are investigating the relationship between fishing success and environ- mental parameters in the eastern tropical Pacific tuna fishery. Pre- liminary analysis with data for the first 3 months of the 1973 fishing season indicated that catch-per-set, mean set size, and successful set probability are significantly correlated with such environmental para- meters as wind speed, cloud cover, wave height, swell height, sea sur- face temperature, and depths of the 60° and 74º F isotherms. Further analyses with a longer series of data are in progress.\nTIBURON LABORATORY\nCOASTAL FISH COMMUNITIES INVESTIGATIONS\nAssessments of Food Available to Nearshore Fishes in Representative Habitats Completed\nAt the Tiburon Laboratory, Dr. Edmund Hobson, Project Leader, and Fishery Biologist Tony Chess, completed the program of quarterly assess- ments of foods available to fishes in representative habitats at Catalina Island, California. This month they completed the last, and most complex, of the six representative habitats under study -- the kelp (Macrocystis) forest. Assessments are based on direct counts along established tran- sect lines, and sampling with dredge and air lift. As in other habitats, resident fishes are among the organisms sampled. Study of the gut con- tents of these fishes demonstrates which of the organisms present are in fact consumed as food.\n29\nCOASTAL FISHERIES INVESTIGATIONS\nPen Rearing of Silver Salmon Starts New Cycle\nThrough the aid of the Northwest Fisheries Center, Seattle, Wash- ington, 51,000 silver salmon smolts were received at the Tiburon Labora- tory as scheduled on August 1. The fish averaged about 19 gm and were in excellent condition upon arrival despite the long journey from Olympia, Washington.\nThe Salmon Rearing and Release Subtask is a cooperative program involving the Tiburon Laboratory, Sea Grant, California Department of Fish and Game, and the Tyee Club, a sportfishermen's organization. The objective is to rear salmon in salt water pens for release into San Francisco Bay to supplement the recreational fishery catch.\nFifty-one thousand silver salmon juveniles being transferred into the floating net pen at the Tiburon Laboratory. Mortality of fish was very low.\n30\nEleven thousand salmon were transferred to Tomales Bay where Sea Grant and several sportfishing groups are undertaking a similar project. The remainder of the fish are presently in two floating pens at the Tiburon Laboratory. After an initial mortality of 2,550 fish in the first 5 days, the mortality rate is now about 42 fish per day. After being fed on moist food which contained antibiotic for 12 days the salmon are now feeding on dry pelletized feed.\nA fish pump was successfully used to transfer fish from one pen to another. During the transfer a videotape system was used to monitor the number of fish being moved. Although results were not spectacular, the system holds some promise of being useful for counting fish.\nAnglers' Guide Approved by Center Director\nThe Anglers' Guide was approved by the Director SWFC this month, after it was returned from reviewer Dan Miller of the CF&G and his suggestions incorporated. Happily, there were few changes. After these have been corrected by the typist, authors Jim Squire, Fishery Biologist at La Jolla, and Susan Smith, Publications Specialist at Tiburon, plan to submit the manuscript to NMFS Scientific Editor, Dr. Bruce Collette, around the first of September.\nThe Guide described marine game fish, fishing grounds, and angler facilities all along the U.S. West Coast (California, Oregon, Washington, and Alaska), and around the tropical islands of Hawaii, American Samoa, and Guam.\nPHYSIOLOGY INVESTIGATIONS\nStaff Gears Up for Striped Bass Program; Work Continues on Manuscripts\nAt the Tiburon Laboratory, Dr. Jeannette W. Struhsaker, Chief, Physiology Investigations, and her staff continued to work on the completion of manuscripts resulting from studies on the effects of mono-aromatic hydrocarbons on fish. Most manuscripts are now in the process of being reviewed. Time was also spent gathering information for the new striped bass program.\nThe staff of the Physiology Investigations toured a portion of the Sacramento-San Joaquin Delta and visited the fish diversion facility at Tracy. The tour was provided by the California Department of Fish and\n31\nGame. The purpose of the trip was to familiarize the staff with the environment in the striped bass spawning and nursery areas in the Delta in preparation for their upcoming laboratory studies on sources of mor- tality in striped bass early life stages. Samples of zooplankton and phytoplankton were also taken in preparation for culture in the labora- tory as food for striped bass larvae.\nA meeting has been planned for September 12 at the Tiburon Labora- tory to discuss striped bass research and to familiarize the physiology staff with work done on this species by other agencies. Members of the California Department of Fish and Game, Bureau of Reclamation, California Department of Water Resources, and the Fish and Wildlife Service have been invited to attend.\nMaxwell Eldridge, Fishery Biologist, continued working on the three manuscripts resulting from studies of the effects of aromatic hydrocar- bons on embryos and larvae of Pacific herring. Pete Benville, Research Chemist, spent part of this month modifying his striped bass/bay shrimp toxicity paper in accordance with one reviewer's comments, and also re- arranging the chemistry laboratory.\nPUBLIC RELATIONS - SOUTHWEST FISHERIES CENTER\nAugust 6 Instructor Carol Eyster and 20 students from Dana Junior High School, San Pedro, California, visited the Center for a lecture on research being conducted at the Center and a tour of Center facilities. Ms. L. Vlymen, Special Assistant, was the lecturer and tour guide.\n29 The following news release was issued by the SWFC - Elbert Ahlstrom named Scientist-of-the-Year by San Diego Society of Natural History.\nSEMINARS\nHonolulu Laboratory\nAugust 6 Mr. Eugene Kridler, U.S. Fish and Wildlife Service, Endanger- ed Species Coordinator for the Hawaiian Islands, spoke on \"Endangered animal species of the Pacific\" at a seminar given at the Honolulu Laboratory.\n13 Commander Merritt N. Walter, formerly commander of the NOAA wire drag ships Rude and Heck and presently commanding offi- cer of the NOAA ship Townsend Cromwell, presented an informal seminar to the Honolulu Laboratory staff on \"Dragging for wrecks with the Rude and Heck.\"\n32\nLa Jolla Laboratory\nAugust 14 Dr. Reuben Lasker, Leader of the Coastal Fisheries Resources Division at the La Jolla Laboratory, presented a talk enti- tled, \"Was the spawning season a disaster for the northern anchovy?\" to begin the fall seminar series at the laboratory.\nTiburon Laboratory\nAugust 8 Dr. Victor Loosanoff of the Pacific Marine Station spoke on 'Biology and Common Sense.\"\n29 Dr. Louis DiSalvo of the Navy Biomedical Laboratory presented results of some of his work on hydrocarbon pollution.\nMEETINGS AND TRAVEL\nAugust 4 Honolulu Laboratory Director Richard Shomura departed Honolulu to attend the Southwest Fisheries Center Management Meeting, August 5-6, in La Jolla. While on the mainland he visited the Tiburon Laboratory, where he discussed the progress of the baitfish transport project with Project Leader Mr. Roger Green.\n5 The Southwest Fisheries Center Executive Committee, consist- ing of the Director, SWFC, Deputy Director, Honolulu and Tiburon Laboratory Directors, and Division Chiefs, La Jolla Laboratory met at the Summer House Inn in La Jolla to discuss, among other matters, adjustment to the base budget for the Center.\n6 Mr. Maxwell Eldridge of the Tiburon Laboratory sampled the water quality in Richardson Bay as part of a bi-monthly sampling cruise conducted in cooperation with the California Regional Water Quality Control Board.\n11 State/Federal Technical Committee meeting, Long Beach, CA. Attended by Dr. Rothschild, Planning Officer David Mackett, and Tiburon Laboratory Director Norm Abramson.\n12-13 Mr. Susumu Kato travelled to Moss Landing Laboratory to attend a Squid Advisory/Technical Panel meeting. The panel was formed by Sea Grant to review its research activity on squid.\n13 Mr. Shomura attended a meeting of the Natural Area Reserves Commission of the State of Hawaii held in the conference room of the Honolulu Laboratory.\n33\n17-19 Dr. William H. Lenarz, Acting Head of the Porpoise/Tuna program at the La Jolla Laboratory, attended a meeting of the American Institute of Biological Sciences held at Oregon State University, Corvallis, Oregon, where he co-chaired a symposium entitled, \"Comparison of biologi- cal predation and fisheries exploitation.\"\n18 Dr. George Kanahele met with Messrs. Shomura and Robert Iversen to discuss Hawaii's 1978 Marine Exposition. Dr. Kanahele is Executive Director of the Hawaii Bicentennial Marine Commission, set up to commemorate the 200th anni- versary of the discovery of the Hawaiian Islands by Captain James Cook.\n18-19 The Physiology Investigations staff at Tiburon accompanied the California Department of Fish and Game's survey boat on a trip to the Sacramento-San Joaquin Delta area to deter- min natural spawning and nursery areas of striped bass.\n19-22 The La Jolla contingent to the 13th Pacific Science Congress in Vancouver, B.C. consisted of Drs. B. Rothschild, M. Laurs, R. Lasker, and Mr. R. Lynn. Dr. Rothschild presented a paper at the Congress entitled, \"The institutional and organizational framework of contemporary fishery regimes.\" The papers pre- sented by Laurs, Lasker and Lynn are described under the sub- mission for the Coastal Fisheries Resources Division earlier in this report.\n21 Mr. Shomura and Drs. Richard Barkley, Andrew Dizon, Robert Skillman, and Jerry Wetherall discussed skipjack tuna re- sources of the Pacific with Dr. Robert Kearney of the South Pacific Commission.\n25-27 Dr. William Fox, Chief, Oceanic Fisheries Resources Division, travelled to Washington, D.C. to review draft propoise en- vironmental impact statement.\n26 Drs. Lenarz and Perrin and Mr. R. McNeely of the NMFS North- west Fisheries Center, Seattle, Washington, attended a plan- ning meeting for a cooperative NMFS-tuna industry porpoise program with representatives of LMR, Inc., in San Diego.\n27 Fishery Biologist James L. Squire of the La Jolla Laboratory was at the Tiburon Laboratory to review the Anglers' Guide, in preparation at the laboratory.\n28 Dr. Barkley presented a talk to the Kiwanis Club of Windward Oahu describing the activities of the Honolulu Laboratory.\n34\nAugust 29 Messrs. Norm Abramson, Susumu Kato, and Roger Green attended a salmon meeting at the Tiburon Laboratory to discuss the proposed salmon program to start in February. The meeting was also attended by represen- tatives of California Department of Fish and Game, Sea Grant at U.C. Davis, and the San Francisco Tyee Club.\nVISITORS\nHonolulu Laboratory\nAugust 12 Dr. Richard Wass, Office of Marine Resources, American Samoa.\n13\nMr. Benjamin Remington, Executive Officer, SWFC, La Jolla. Dr. Makoto Suzuki, Tokyo University of Fisheries, Tokyo.\n18 Ms. J. Anita Coit, Administrative Assistant, SWFC, La Jolla.\n19 Dr. Robert Kearney, South Pacific Commission, Noumea, New Caledonia.\n21 Mr. Palmer Sekora, U.S. Fish and Wildlife Service, Honolulu. Ms. Carol Takara, Librarian, Environmental Protection Agency, Honolulu.\n25 Mr. Arthur Woodland, South China Sea Programme, Manila.\n29 Mr. Nick Trutanic, Star-Kist Foods, Inc., California. Mr. Philip M. Roedel, Fisheries Advisor, U.S. AID.\nLa Jolla Laboratory\nAugust 1 Mr. Vladimir Gurevich, Sea World, Inc., San Diego.\n7 Mr. Makoto Suzuki, Tokyo University of Fisheries, Tokyo, Japan.\n4-8 Dr. William Aron, Director, Office of Ecology and Environ- mental Conservation, Mr. Herb Blatt, NOAA Staff Attorney, and Mr. Pete Jensen, Staff Specialist, Marine Mammal and Endangered Species Divison, Washington, D.C. to confer on Porpoise Progress report for FY 1975.\n35\n11-15 Mr. Carmen Blondin, Mr. Fred Olson, Barbara Keith, NMFS Office of International Fisheries attended the Tuna Policy Committee Meeting.\n15 Mr. J. P. Fennell, Wickford Shellfish, Inc., Wickford, R.I.\n18 Dr. E. J. McGrath, Science Applications.\n26 Mr. Harold J. Loeffler, La Jolla Light, La Jolla, CA.\n26 Mr. Richard McNeely, NMFS Northwest Fisheries Center, Seattle, Washington, to confer with members of the tuna industry regarding NMFS gear charters.\n27 Admiral H. R. Lippold, Director of the Pacific Marine Center, National Ocean Survey, Seattle, Washington.\nTiburon Laboratory\nAugust 1 Robert Brown, San Francisco Tyee Club, San Francisco, CA. Carl G. Eschler, San Francisco Tyee Club, San Francisco, CA. Frank Corbelli, San Francisco Tyee Club, San Francisco, CA.\n4 William Eschmeyer, California Academy of Sciences, San Francisco, CA.\nS. B. Craig, California Academy of Sciences, San Francisco, CA.\nPeter Rodde, California Academy of Sciences, San Francisco, CA.\nDiane Koepke, California Academy of Sciences, San Francisco, CA.\n6 Bob Spain, Marin County Schools.\nErnie White, Marine County Schools.\nRobert Huffer, Scripps Institution of Oceanography, La Jolla, CA.\n7 H. R. Mullick, COMPAC Area, USCG.\n8 Tak Sukikano, University of California, Santa Cruz, CA Margaret Bradbury, San Francisco University, San Francisco, CA.\n36\nAugust 8 Phyllis Faber, Madrone Associates.\n13 Tom Sawhill, Evergreen State College.\n15 Chris Dewees, Sea Grant, U.C. Davis, Davis, CA.\n19 William Eschmeyer, California Academy of Sciences, San Francisco, CA.\n20 Duncan Poland, Sonoma State College, CA. John Arnold, Sonoma State College, CA.\nCharles Fuller, HEW, San Francisco, CA.\n21 Kent Scudder, University of Colorado.\n26 Al Petrovich, California Department of Fish and Game, Sacramento, CA.\nEd Greenhood, California Department of Fish and Game, Sacramento, CA.\nBruce Danielson, Scripps Institution of Oceanography, La Jolla, CA.\nFrank Hubbard, California Department of Fish and Game, Long Beach, CA.\nR. G. Kaneen, California Department of Fish and Game, Menlo Park, CA.\nHerb Fry, California Department of Fish and Game, Long Beach, CA.\nJ. L. Baxter, California Department of Fish and Game, Menlo Park, CA.\nJ. D. Spratt, California Department of Fish and Game, Monterey, CA.\n27 James L. Squire, Southwest Fisheries Center, La Jolla, CA.\n28 Earl Simm, San Francisco State University, San Francisco, CA.\n29 Chris Dewees, Sea Grant, U.C. Davis, Davis, CA.\nHarold Guard, U.C. Berkeley, Navy Biomedical Center, Alameda, CA.\n37\nAugust 29 Louis DiSalvo, U.C. Berkeley, Navy Biomedical Center, Alameda, CA.\nPaul Jensen, California Department of Fish and Game. Jack Robinson, California Department of Fish and Game. William VerBrugge, San Francisco Tyee Club, San Francisco, CA.\nCharles Moe, San Francisco Tyee Club, San Francisco, CA.\nPERSONNEL\nLaboratory\nAugust 1 Nina D. Hirsch, Biological Laboratory Technician, Resignation\nTiburon\nPatricia A. Marshall, Biological Aid, Resignation\nTiburon\n3 Peter L. Abbatello, Maintenance Mechanic, Appointment, part-time\nTiburon\nRichard Evans, Oceanographer, Promotion\nLa Jolla\n7 Richard A. Bierma, Biological Technician, Honolulu\nTemporary Appointment NTE 30 days\n11 Carla Thomas, Clerk-Typist, EOD La Jolla Temporary\n17 James R. Chess, Fishery Biologist, Promotion Tiburon\n18 Bruce L. Crumley (Lieutenant, NOAA Corps) , OIC, Kewalo Basin Facility, Resignation\n25 Nancy LaRoche, Clerk-Steno, EOD La Jolla Appointment\n31 William Perrin, Fishery Biologist, Promotion La Jolla\n31 Joanne Webber, Secretary (Typing), Promotion La Jolla\n31 Kate Coleman, Secretary (Typing), Promotion La Jolla\n38\nTRAINING\nAugust 22 Computer Technician Sally Kuba at the Honolulu Laboratory, completed a 3-day course on SPSS (Statistical Package for the Social Services) in Honolulu.\n25-28 Catherine J. C. Hurst of the Tiburon Laboratory partici- pated in a course on Federal Supply Schedules, sponsored by CSC, San Francisco.\n26-28 Ms. Dorothy Roll, Computer Systems Analyst, La Jolla Labora- tory, attended a Civil Service Commission course on \"Techni- ques of file design and data base structure,\" in San Diego.\nHONORS AND AWARDS\nAugust 3 Robert Butler, Computer Technician and Charles Oliver, Computer Technician, La Jolla Laboratory, each received cash awards of $260 for their contributions to the develop- ment of a data management system to edit data collected by NMFS field technicians at sea on porpoise/tuna interactions.",
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                    "content": "by",
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            "lines": [
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                    "content": "SOUTHWEST FISHERIES CENTER",
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                {
                    "content": "LA JOLLA, CALIFORNIA",
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                {
                    "content": "HONOLULU LABORATORY",
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                {
                    "content": "LA JOLLA LABORATORY",
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                    "content": "TIBURON LABORATORY",
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                },
                {
                    "content": "MONTHLY REPORT - AUGUST 1975",
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                },
                {
                    "content": "STATUS OF PUBLICATIONS",
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                {
                    "content": "Published",
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                            "offset": 1355,
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                },
                {
                    "content": "Hobson, Edmund S. 1975. Marine animals hazardous to divers. In",
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                    ]
                },
                {
                    "content": "The NOAA Diving Manual, Chapter 15. Department of Commerce,",
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                    ]
                },
                {
                    "content": "15-1 to 15-17.",
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                            "offset": 1488,
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                    ]
                },
                {
                    "content": "This is an account of the marine organisms that are poten-",
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                {
                    "content": "tial hazards to divers during NOAA operations.",
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                            "offset": 1562,
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                    ]
                },
                {
                    "content": "Kiefer, Dale A., and Reuben Lasker. 1975. Two blooms of Gymno-",
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                    ]
                },
                {
                    "content": "dinium splendens, an unarmored dinoflagellate. Fish. Bull.,",
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                },
                {
                    "content": "U.S. 73(3): 675-678.",
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                },
                {
                    "content": "This note reports upon two field studies of blooms of G. splen-",
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                {
                    "content": "dens, one in Coyote Bay of Bahia Concepcion, Gulf of California",
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                {
                    "content": "and the second in coastal waters of the Southern California",
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                {
                    "content": "Bight. In both occurrences G. splendens dominated the phyto-",
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                {
                    "content": "plankton crop so that measurements of primary production and",
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                {
                    "content": "the chemical composition of suspended particles allowed a",
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                {
                    "content": "reasonable description of this species.",
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                },
                {
                    "content": "Lasker, Reuben. 1975. Field criteria for survival of anchovy",
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                {
                    "content": "larvae: The relation between inshore chlorophyll maximum",
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                {
                    "content": "layers and successful first feeding. Fish. Bull., U.S. 73(3) :",
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                    "content": "453-462.",
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                    "content": "Northern anchovy larvae, Engraulis mordax, produced by labora-",
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                    "content": "tory-spawned fish, have been used to detect concentrations of",
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                    "content": "larval fish food in situ along the California coast. First-",
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                    "content": "feeding larval anchovies, whose development was controlled by",
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                    "content": "2",
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                        {
                            "offset": 3278,
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                },
                {
                    "content": "and nonliving particles were never in high enough concentration",
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                {
                    "content": "or of the proper size to be eaten by the larvae. A storm which",
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                {
                    "content": "caused extensive mixing of the top 20 m of water obliterated",
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                    "content": "the chlorophyll maximum layer and effectively destroyed this",
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                {
                    "content": "feeding ground of the larval anchovy.",
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                },
                {
                    "content": "Otsu, Tamio. 1975.",
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                {
                    "content": "Results of tuna live bait transporting experi-",
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                },
                {
                    "content": "ments of the Honolulu Laboratory (Honolulu Suisan Kenkyusho no",
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                        {
                            "offset": 3690,
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                    ]
                },
                {
                    "content": "saozuri ikie yuso shiken kekka). [In Jap.] Proceedings, 1974",
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                {
                    "content": "Tuna Research Conference, Shimizu, Japan, February 4-6, 1975.",
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                    ]
                },
                {
                    "content": "Fisheries Agency, Far Seas Fisheries Research Laboratory, p.",
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                        {
                            "offset": 3876,
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                },
                {
                    "content": "239-243.",
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                    ]
                },
                {
                    "content": "Yong, Marian Y. Y., and Robert A. Skillman. 1975. A computer pro-",
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                },
                {
                    "content": "gram for analysis of polymodal frequency distributions (ENORMSEP),",
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                },
                {
                    "content": "FORTRAN IV. Fish. Bull., U.S. 73:681.",
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                {
                    "content": "Program ENORMSEP (Extended Normal Separator Program) separates a",
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                            "offset": 4117,
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                    ]
                },
                {
                    "content": "polymodal frequency distribution into its component groups where",
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                        {
                            "offset": 4182,
                            "length": 64
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                    ]
                },
                {
                    "content": "aging studies have not been performed. It calculates preliminary",
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                        6.5953,
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                    "spans": [
                        {
                            "offset": 4247,
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                    ]
                },
                {
                    "content": "estimates of the number of size groups and their points of over-",
                    "polygon": [
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                        6.5041,
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                    "spans": [
                        {
                            "offset": 4312,
                            "length": 64
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                    ]
                },
                {
                    "content": "lap using probit analysis and polynomial regression techniques.",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 4377,
                            "length": 63
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                    ]
                },
                {
                    "content": "A description of the program, with input and output for two",
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                        6.722,
                        6.0894,
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                    "spans": [
                        {
                            "offset": 4441,
                            "length": 59
                        }
                    ]
                },
                {
                    "content": "examples, is available from the authors.",
                    "polygon": [
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                        {
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                },
                {
                    "content": "Approved by Center Director",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 4542,
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                    ]
                },
                {
                    "content": "\"Magnitude and ecological implications of thermal inertia in skip-",
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                        {
                            "offset": 4570,
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                    ]
                },
                {
                    "content": "jack tuna, Katsuwonus pelamis (Linnaeus)\" by William H. Neill,",
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                    ]
                },
                {
                    "content": "Randolph K. C. Chang, and Andrew E. Dizon. For publication in",
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                    "spans": [
                        {
                            "offset": 4700,
                            "length": 61
                        }
                    ]
                },
                {
                    "content": "J. Exp. Mar. Biol. Ecol. (Netherlands).",
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                    "spans": [
                        {
                            "offset": 4762,
                            "length": 39
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                    ]
                },
                {
                    "content": "\"Monitoring the ocean environment\" by L. E. Eber.",
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                {
                    "content": "For publication",
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                        {
                            "offset": 4852,
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                        }
                    ]
                },
                {
                    "content": "in Mar. Fish. Rev.",
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                {
                    "content": "\"Anglers' Guide to the United States Pacific Coast\" by James L.",
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                {
                    "content": "Squire and Susan E. Smith. NMFS Special Publication.",
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            "pageNumber": 4,
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                    "content": "HONOLULU",
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                    "content": "ENVIRONMENT",
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                {
                    "content": "INVESTIGATIONS",
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                {
                    "content": "Honolulu",
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                {
                    "content": "Experimental",
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                    "content": "HONOLULU LABORATORY",
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                    "content": "Mr. Minato Yasui, a graduate student from Tokai University, has",
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                    "content": "and excess body temperatures. The results, contrasted with skipjack",
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                    "content": "the increased metabolic rate then contributes to faster rates of warm-",
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                    "content": "ing. 3) However, no evidence of a relationship between excess tempera-",
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                    "content": "ture of the red muscle and water temperature was discovered. Increased",
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                    "content": "metabolic rate should result in a larger temperature excess. Perhaps",
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                    "content": "the positive relationship between excess temperature and water tempera-",
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                    "content": "Research Assistant Reports on Responses",
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                    "content": "of Tunas to Olfactory Cues",
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                    "content": "Mr. Walter Ikehara, Research Assistant with the Hawaii Institute",
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                    "content": "of Marine Biology, University of Hawaii, reports that various solutions",
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                    "spans": [
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                    ]
                },
                {
                    "content": "Percent",
                    "polygon": [
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                    ]
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                {
                    "content": "Body wt",
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                    ]
                },
                {
                    "content": "Yellowfin",
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                    ]
                },
                {
                    "content": "2.701 kg",
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                {
                    "content": "52.2",
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                    ]
                },
                {
                    "content": "cm",
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                    ]
                },
                {
                    "content": "183.7 g",
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                    ]
                },
                {
                    "content": "6.8",
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                        }
                    ]
                },
                {
                    "content": "200.0 g",
                    "polygon": [
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                    ]
                },
                {
                    "content": "7.4",
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                        }
                    ]
                },
                {
                    "content": "220.0 g",
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                    ]
                },
                {
                    "content": "8.0",
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "~380 g",
                    "polygon": [
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                        }
                    ]
                },
                {
                    "content": "14",
                    "polygon": [
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                    "spans": [
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                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Kawakawa",
                    "polygon": [
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                    "spans": [
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                            "length": 8
                        }
                    ]
                },
                {
                    "content": "1.852 kg",
                    "polygon": [
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                    "spans": [
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                            "length": 8
                        }
                    ]
                },
                {
                    "content": "45.9",
                    "polygon": [
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "cm",
                    "polygon": [
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "132.9 g",
                    "polygon": [
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                    ]
                },
                {
                    "content": "7.0",
                    "polygon": [
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                    "spans": [
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                            "length": 3
                        }
                    ]
                },
                {
                    "content": "119.3 g",
                    "polygon": [
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                    ]
                },
                {
                    "content": "6.4",
                    "polygon": [
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                    "spans": [
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                            "length": 3
                        }
                    ]
                },
                {
                    "content": "115.2 g",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "6.2",
                    "polygon": [
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "~240 g",
                    "polygon": [
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                    "spans": [
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                            "length": 6
                        }
                    ]
                },
                {
                    "content": "13",
                    "polygon": [
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                    "spans": [
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                            "offset": 8473,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "Skipjack",
                    "polygon": [
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "2.028 kg",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "49.0",
                    "polygon": [
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                    "spans": [
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                            "length": 4
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                    ]
                },
                {
                    "content": "cm",
                    "polygon": [
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                    "spans": [
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                            "offset": 8499,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "--",
                    "polygon": [
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                        1.4859,
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                    "spans": [
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                            "offset": 8502,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "-",
                    "polygon": [
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                        2.4249,
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                        2.4249,
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                        2.3292,
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                    "spans": [
                        {
                            "offset": 8505,
                            "length": 1
                        }
                    ]
                },
                {
                    "content": "--",
                    "polygon": [
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                        3.1587,
                        7.6836,
                        3.1587,
                        7.7474,
                        2.9946,
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                    ],
                    "spans": [
                        {
                            "offset": 8507,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "-",
                    "polygon": [
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                        7.679,
                        4.0749,
                        7.7428,
                        3.9883,
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                    ],
                    "spans": [
                        {
                            "offset": 8510,
                            "length": 1
                        }
                    ]
                },
                {
                    "content": "119.5 g",
                    "polygon": [
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                        7.6198,
                        5.146,
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                    "spans": [
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                            "length": 7
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                    ]
                },
                {
                    "content": "6.0",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "~425 g",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "21",
                    "polygon": [
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                    "spans": [
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                            "length": 2
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                    ]
                },
                {
                    "content": "Skipjack",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "1.599 kg",
                    "polygon": [
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                    ]
                },
                {
                    "content": "45.0",
                    "polygon": [
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                    "spans": [
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                            "offset": 8552,
                            "length": 4
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                    ]
                },
                {
                    "content": "cm",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "163.8 g",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "10.2",
                    "polygon": [
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                            "length": 4
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                    ]
                },
                {
                    "content": "121.6 g",
                    "polygon": [
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                    ]
                },
                {
                    "content": "7.6",
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                    "spans": [
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                            "offset": 8581,
                            "length": 3
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                    ]
                },
                {
                    "content": "119.5 g",
                    "polygon": [
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                    ]
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                {
                    "content": "7.5",
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                    "spans": [
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                    ]
                },
                {
                    "content": "~320 g",
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                {
                    "content": "20",
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                    "spans": [
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                    ]
                },
                {
                    "content": "Fish did not begin feeding until dawn (0600 to 0615); fish usually",
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                    "spans": [
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                    ]
                },
                {
                    "content": "stopped eating after dusk, and no fish ever accepted food after 1930.",
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                    ]
                },
                {
                    "content": "The values for percent body weight per day during continuous feeding",
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                    ]
                },
                {
                    "content": "indicate consistent performance, although values did range as high as",
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                    ]
                },
                {
                    "content": "41% body weight per day on isolated occasions. The experiments utilizing",
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            ],
            "spans": [
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        },
        {
            "pageNumber": 6,
            "angle": 0.35585999488830566,
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            "unit": "inch",
            "words": [
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                    "content": "5",
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                    "confidence": 0.996,
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                    "content": "to",
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                    "confidence": 0.999,
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                {
                    "content": "satiation",
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                    "content": "per",
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                        2.306,
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                        2.4245
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                    ]
                },
                {
                    "content": "jack tuna empty their stomachs by 50% in the first 4 hours after a meal.",
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                },
                {
                    "content": "Therefore, food consumption when stomachs were empty (0900) and 50% full",
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                {
                    "content": "(1300) was of interest. The third school of fish is currently being",
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                {
                    "content": "moved to one feeding per day.",
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                {
                    "content": "Routine Respiration Rates Determined for",
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                },
                {
                    "content": "Tunas Other Than Skipjack Tuna",
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                },
                {
                    "content": "After use in the preceding feeding experiment, fish were starved",
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                },
                {
                    "content": "for 24 hours and individually tested by Mr. Thomas Byles to determine",
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                },
                {
                    "content": "respiration rates. Values obtained for the yellowfin tuna were 0.584,",
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                {
                    "content": "0.474, and 0.500 mg 02 g-1 hr-1 for three different replications; for",
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                },
                {
                    "content": "the kawakawa were 0.865 and 1.078 mg 02 g-1 hr-1; and for a second",
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                },
                {
                    "content": "kawakawa (47.0, 2.472 kg) were 0.539, 0.572, and 0.571 mg 02 g-1 hr-1.",
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                {
                    "content": "Elevation of respiration rate of the first kawakawa was probably caused",
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                {
                    "content": "by allowing oxygen levels to fall too low during the test. With skip-",
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                {
                    "content": "jack tuna, oxygen levels below about 4 ppm result in very increased",
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                {
                    "content": "activity levels which would elevate consumption rate.",
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                {
                    "content": "Behavioral Thermoregulation Tank, Which Will Measure",
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                    "content": "Temperature Preference of Tunas, Nears Completion",
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                    "content": "Progress has been made towards a fully operational behavioral thermo-",
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                },
                {
                    "content": "regulation tank. The fiberglass box that holds the 24, 7.5 KVA heaters",
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                    "content": "has now been encased in concrete, 6 inches thick. Mr. Randolph Chang did",
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                    "content": "the masonry work. The box now withstands more than the necessary 15 psi",
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                    "content": "pressure. Besides calibration of the system, all that remains is wiring",
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                {
                    "content": "of the heaters.",
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                    "content": "* *",
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                    "content": "The rough draft of a manuscript, \"Swimming speed as a function of",
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                    "content": "temperature in three species of tunas\" by A. E. Dizon and W. H. Neill",
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                    "content": "has been completed and is undergoing revisions. Some of the results of",
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                    "content": "the latter paper will be presented at the upcoming American Fisheries",
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                {
                    "content": "Society meeting by the senior author.",
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                {
                    "content": "through",
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                    "content": "Honolulu Laboratory Fishery Scientists Gather Data,",
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                    "content": "Kailua-Kona, Hawaii August 2 through 10. NMFS Fishery Biologist Heeny",
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                    "content": "ably assisted by Mr. Sumida, collected data on catch and effort in",
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                    "content": "fishery.",
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                    "content": "they could spend 46.0 days fishing.",
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                    "content": "describing the status of research done on the biology, systematics,",
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                    "content": "distribution, and fisheries for frigate mackerels, Auxis thazard and",
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                    "content": "A. rochei, on a worldwide basis.",
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                    "content": "Townsend Cromwell Scouts for Hawaii's Missing Skipjack Tuna",
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                    "content": "to make an appearance. In the course of the local scouting cruise,",
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                    "content": "Corsair in Hilo. Using the shad and three to four buckets of nehu,",
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                    "content": "3 to 4-pound fish. Corsair captain Mr. Chaco Yamamoto reported that",
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                    "content": "skipjack tuna fished with shad was \"rough.\" Like other fishermen, Mr.",
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                    "content": "jack tuna.",
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                    "content": "Townsend Cromwell also transported 18 large milkfish from the",
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                    "content": "historic Hawaiian fish ponds at Puako, Hawaii to Honolulu for experi-",
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                    "content": "ments at the Oceanic Institute.",
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                    "content": "During the period July 26 to August 29, Government of American",
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                    "content": "Samoa employee Pulou Niuatoa recorded the lengths of. 1,212 albacore",
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                    "content": "from 29 fishing vessels unloading in Pago Pago. He also collected 32",
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                },
                {
                    "content": "sets of catch and effort data. Utilizing data from five vessels, an",
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                    "content": "average size of 90.1 cm was determined and an albacore catch per 100",
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                    "content": "hooks of 1.47.",
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                    "content": "August Report From the Hawaiian Skipjack Tuna Fishery",
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                    "content": "The August 1975 catch of skipjack tuna in the Hawaiian fishery was",
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                    "content": "an estimated 243.6 MT. This was 198.8 MT below the catch for August 1974",
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                    "content": "and 474.6 MT below the August average for 1948-74. The catch from Janu-",
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                    "content": "ary through August was estimated at 1,728.5 MT, 980.0 MT below last year's",
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                    "content": "batch for the same period and 1,712.0 MT below the long-term average.",
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                    "content": "fields.",
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                    "content": "Dr. Laurs presented a paper entitled \"Variations in the distri-",
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                    "content": "bution and availability of albacore tuna in the eastern North Pacific",
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                    "content": "and marine environmental influences.\" Geographical variations in the",
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                    "content": "distribution and availability of albacore in the eastern North Pacific",
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                    "content": "Ocean as indicated by shifts in the location of the fishery which takes",
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                    "content": "place in waters off North America were discussed. Evidence was pre-",
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                    "content": "sented linking the observed variations in the distribution and avail-",
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                    "content": "ability of albacore with variations in the marine environment. Based",
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                    "content": "on recent research findings, Dr. Laurs concluded 1) that the migration",
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                    "content": "route which albacore follow into the waters off North America is linked",
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                    "content": "to the oceanic boundary structure associated with the Transition Zone",
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                    "content": "between north and central Pacific waters, and 2) that variations in the",
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                    "content": "location and development of the boundaries of the Transition Zone waters",
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                    "content": "in offshore waters influence the distribution and availability of alba-",
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                {
                    "content": "core in near shore waters.",
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                    "content": "Mr. Lynn presented a paper entitled, \"On the year-to-year differences",
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                },
                {
                    "content": "in the characteristics of the California Current.\" This paper was co-",
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                    "content": "authored with Professor J. L. Reid, Director of Marine Life Research,",
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                {
                    "content": "SIO. Lynn and Reid noted that the annual variation of steric height",
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                    "content": "is coherent and smooth over the CalCOFI of the California Current area.",
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                },
                {
                    "content": "The monthly means, available in an atlas, show the tendencies for sea-",
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                },
                {
                    "content": "sonal changes in the strength of the geostrophic flow and in the eddies",
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                },
                {
                    "content": "and counterflows. From the steric height in any month, the mean can be",
                    "polygon": [
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                },
                {
                    "content": "subtracted to produce an anomaly which can be viewed as the difference",
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                {
                    "content": "of geostrophic flow of a particular month from the seasonal mean. When",
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                },
                {
                    "content": "the nonseasonal variation in steric height is large, it can produce",
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                    "spans": [
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                },
                {
                    "content": "generally coherent patterns over the region. In January 1958, for",
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                },
                {
                    "content": "example, this anomaly field has a cyclonic pattern centered about 200",
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                    "content": "to 300 km off Baja California, which indicates a stronger-than-average",
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                    "content": "The large coherent patterns in the geostrophic flow differences",
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                    "content": "Where there were large regions of above normal temperature there was",
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                    "content": "above normal steric height. In that steric height is the integration",
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                    "content": "of a quantity that increases with increased temperature this result",
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                    "content": "suggests that the temperature anomalies extend to considerable depth.",
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                    "content": "This was confirmed in an examination of the vertical distributions of",
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                    "content": "the STD tapes but found that only 4 out of 63 stations had recorded.",
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                    "content": "catch-per-unit estimates for the U.S. albacore fishery. Some new com-",
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                    "content": "fishery",
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                },
                {
                    "content": "June,",
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                {
                    "content": "the",
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                    "span": {
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                },
                {
                    "content": "fish",
                    "polygon": [
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                {
                    "content": "appear",
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            ],
            "lines": [
                {
                    "content": "11",
                    "polygon": [
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                            "offset": 23528,
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                },
                {
                    "content": "have been scouting and tagging albacore in the near shore waters from",
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                },
                {
                    "content": "Guadalupe Island to the southern tip of Queen Charlotte Islands. Bio-",
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                {
                    "content": "logical technicians from the SWFC are on board two of these vessels to",
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                {
                    "content": "tag albacore, gather oceanographic and meteorological data, and collect",
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                {
                    "content": "biological samples.",
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                {
                    "content": "Each of the three chartered vessels is scheduled for three, 25-day",
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                {
                    "content": "cruises. All are reporting daily catch and weather information to the",
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                    "content": "AFRF and subsurface temperature BATHY reports to NMFS radio station WWD.",
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                    "content": "The information received is transmitted to other fishermen and interested",
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                {
                    "content": "persons by the fishing fleet and AFRF through ship-to-ship and ship-to-",
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                    "content": "shore radio transmissions and by the La Jolla Laboratory through the",
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                },
                {
                    "content": "daily Albacore Fishery Information radio broadcasts prepared by Mr.",
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                },
                {
                    "content": "Nishimoto, Fishery Biologist. These reports are helpful in reducing",
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                },
                {
                    "content": "search-time for albacore concentrations and planning of fishing tac-",
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                    "content": "tics. Weather observations and BATHY reports are also relayed to Navy",
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                {
                    "content": "Fleet Numerical Weather Central in Monterey and the weather observations",
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                },
                {
                    "content": "to NWS.",
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                },
                {
                    "content": "Along with the collection of fishery and oceanographic data, an",
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                    "content": "estimated 450 albacore have been tagged and released by the AFRF char-",
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                },
                {
                    "content": "ter vessels. The joint NMFS-AFRF tagging program is being conducted",
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                {
                    "content": "to study movements of albacore along the North American coast and",
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                },
                {
                    "content": "associated oceanographic factors.",
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                },
                {
                    "content": "Japanese Fishermen Recover Large Number of Albacore Tagged",
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                },
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                    "content": "During Joint NMFS-AFRF Albacore Tagging Program",
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                    ]
                },
                {
                    "content": "Dr. Laurs reports that 37 recoveries were made in 1975 by Japanese",
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                    ]
                },
                {
                    "content": "albacore tuna fishermen in the western North Pacific of albacore tagged",
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                },
                {
                    "content": "and released in the eastern North Pacific during the joint NMFS-AFRF",
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                },
                {
                    "content": "albacore tagging program. Of these recoveries, 36 were taken on live",
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                            "offset": 25233,
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                    ]
                },
                {
                    "content": "bait fishing vessels and 1 on a longline. A total of 64 tagged alba-",
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                },
                {
                    "content": "core which were tagged during the joint NMFS-AFRF tagging program have",
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                {
                    "content": "been recovered by Japanese and Korean fishermen, 58 caught on Japanese",
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                    "content": "live bait vessels, 5 on Japanese longline vessels and 1 on a Korean long-",
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                    "content": "line vessel. The results from the tag recoveries provide new information",
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                },
                {
                    "content": "on the 1) seasonal development and distribution of the Japanese live bait",
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                    "content": "and",
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                {
                    "content": "sound",
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                {
                    "content": "12",
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                            "offset": 26349,
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                },
                {
                    "content": "to follow a narrow, well-defined emigration route extending over only",
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                {
                    "content": "a couple degrees of latitude and centered in the Emporer Seamount area",
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                },
                {
                    "content": "at about 35º N, 171º W. The latter conclusion is based on the recovery",
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                {
                    "content": "of 29 tagged fish within very close proximity of each other in the vi-",
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                {
                    "content": "cinity of the Emporer Seamount within a 3 week period in June 1975, and",
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                },
                {
                    "content": "the recovery of 14 tagged fish in the same area during a 12-day period",
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                },
                {
                    "content": "in mid-June 1974. One of the tagged fish which was captured in June",
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                {
                    "content": "1975 near the Emporer Seamount was tagged 21 days earlier by a U.S.",
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                },
                {
                    "content": "jig vessel conducting exploratory fishing in the western North Pacific",
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                },
                {
                    "content": "in cooperation with the La Jolla Laboratory (see April SWFC Monthly Re-",
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                },
                {
                    "content": "port). The fish was tagged 400+ miles WSW from where it was recovered.",
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                    "content": "Assuming a straightline movement and that the fish was caught immediate-",
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                },
                {
                    "content": "ly upon entering the location where it was recovered, the fish moved",
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                    "content": "eastward at slightly over 20 miles per day.",
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                    "content": "It is well-established that the North Pacific population of alba-",
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                    "content": "core tuna supports three main fisheries - North American surface fish-",
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                    "content": "ery, Japanese live bait surface fishery, and Japanese longline subsur-",
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                    "content": "face fishery - and that there are movements of fish among these fish-",
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                    "content": "eries. There is disagreement in the literature, however, concerning",
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                    "content": "the pattern of movement among the fisheries. According to some inves-",
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                    "content": "tigators the albacore move from the U.S. fishery mainly to the Japanese",
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                    "content": "longline fishery and then to the Japanese live bait fishery, with some",
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                    "content": "exchange from both of the Japanese fisheries back to the U.S. fishery.",
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                    "content": "Another hypothesis is that fish upon leaving the U.S. fishery mainly",
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                    "content": "enter the Japanese live bait fishery and then the Japanese longline",
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                {
                    "content": "fishery. Results from the joint NMFS-AFRF tagging program conclusively",
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                    "content": "demonstrate that the latter hypothesis is correct. Ninety-two percent",
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                    "content": "of the tagged albacore recovered by the Japanese have been from live",
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                    "content": "bait fishing vessels and the majority of these recoveries were made",
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                    "content": "during the first Japanese live bait fishing season following release",
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                {
                    "content": "of the fish.",
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                },
                {
                    "content": "ECOLOGY OF THE CALIFORNIA CURRENT",
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                    "content": "Hydroacoustics Cruise Conducted off the Los Angeles",
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                    "content": "Bight Aboard NOAA Research Vessel, Jordan",
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                    "content": "Dr. Paul Smith, Fishery Biologist at the La Jolla Laboratory,",
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                    "content": "headed a group of scientists who conducted a hydroacoustics cruise",
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                    "content": "off the Los Angeles Bight aboard the NOAA research vessel, David Starr",
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                    "content": "Jordan, August 5 to 15. The objectives of the cruise were to obtain",
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                    "content": "direct (camera) and indirect (acoustic) measures of anchovy school",
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                    "content": "compactions, obtain aerial photographs of anchovy schools, vertical",
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                    "content": "high frequency acoustic measurements of volume reverberation and sound",
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                    "content": "cise in the use of CalCOFI bongo net tows for personnel from the In-",
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                    "content": "stituto Nacional de Pesca (INP), Mexico City and the Pacific Marine",
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                {
                    "content": "Environmental Laboratory (PMEL), Seattle, Washington.",
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                    "content": "According to Dr. Smith, anchovy schools were approached and in-",
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                {
                    "content": "sonified using the 11 kHz and 30 kHz scientific sonars on the Jordan.",
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                    "content": "A skiff was directed onto the schools using the ship's sonar, radar",
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                    "content": "and a skiff-mounted portable echo sounder. Free vehicle and tethered",
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                    "content": "underwater camera drops were conducted from the skiff.",
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                {
                    "content": "Two signal processing systems were in use aboard the Jordan. A",
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                {
                    "content": "NMFS-designed system using a Digital DPD 8 computer and a Navy-designed",
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                {
                    "content": "system built around a Hewlett-Packard 2100 computer. The input signal",
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                    "content": "to both systems was the echo, after amplification and filtering, re-",
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                    "content": "ceived by the 30 kHz sonar transducer. Echoes from 48 arbitrarily",
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                    "content": "selected schools were recorded simultaneously by both systems. The",
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                    "content": "Navy system also recorded acoustic information on two schools outside",
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                    "content": "the observation band sampled by the NMFS system.",
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                    "content": "Underwater camera drops were made into 34 of the 50 schools which",
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                    "content": "were acoustically interrogated. Sixteen additional drops were made on",
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                    "content": "schools not recorded by either system due to range-gating limitations.",
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                    "content": "Aerial reconnaissance was conducted on 2 days previous to the",
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                    "content": "cruise. Concentrations of anchovy schools were located 5 miles off",
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                    "content": "the coast from Dana Point to Point Fermin; the aircraft operated during",
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                    "content": "the cruise for 2 to 3 hours on each of 3 days. Low overcast and poor",
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                    "content": "radio communications prohibited more extensive participation. Visual",
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                    "content": "confirmation of the dimensions and shape of a school detected by sonar",
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                    "content": "was accomplished. Three camera drops on separate schools were directed",
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                    "content": "by an aerial observer.",
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                    "content": "Sonar mapping of fish schools was conducted on one night between",
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                    "content": "2000 and 0400 hours using the 30 kHz sonar with 10 msec pulses. Two",
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                    "content": "hundred and twenty-six targets, presumed to be fish schools, were logged",
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                    "content": "during the 8-hour period. Distributions of target size and target",
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                    "content": "strength were compared with data taken during daylight hours. The",
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                    "content": "night schools appeared, on this occasion, to be larger in size and",
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                    "content": "lower in target strength than the long-term average values for daytime",
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                    "content": "schools. Observations of schools during first light (beginning of nau-",
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                    "content": "tical twilight) indicate a 5 decibel (3-fold) increase in average echo",
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                    "content": "intensity over a period of 20 minutes. These observations suggest the",
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                    "content": "and form into smaller, more compact schools as dawn approaches.",
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                    "content": "midwater trawls and 4 to 15 m midwater trawls were made off the coast at",
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                    "content": "Dana Point, in Santa Monica Bay, and southeast of the Santa Catalina",
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                    "content": "larvae",
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            ],
            "lines": [
                {
                    "content": "14",
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                    "spans": [
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                    ]
                },
                {
                    "content": "Islands. While the cruise was successful in locating schools of",
                    "polygon": [
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                },
                {
                    "content": "adult anchovy for study, the young-of-the-year were not as adequate-",
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                    ]
                },
                {
                    "content": "ly sampled as anticipated. Additional anchovy fry, for otolith aging,",
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                    "spans": [
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                    ]
                },
                {
                    "content": "will be obtained from various bait haulers in southern California and",
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                    ]
                },
                {
                    "content": "from blanket net samples taken on the sea survey cruises of the Cali-",
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                },
                {
                    "content": "fornia Department of Fish and Game.",
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                {
                    "content": "Lowest Sea Temperatures Recorded at Scripps Pier",
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                },
                {
                    "content": "Dick Evans, Oceanographer at the La Jolla Laboratory, reports that",
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                {
                    "content": "on August 5, 1975 the water temperature at Scripps Pier dipped to 57º F",
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                },
                {
                    "content": "(13.9º C). This was 0.2º F below the previous low temperature recorded",
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                },
                {
                    "content": "for August in the 68 years that water temperature records have been kept",
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                },
                {
                    "content": "for Scripps Pier. Dr. Paul Smith of the La Jolla Laboratory was on board",
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                },
                {
                    "content": "the R/V David Starr Jordan during this period and he undertook to docu-",
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                },
                {
                    "content": "ment this phenomenon by conducting an XBT transect from Scripps Pier off-",
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                },
                {
                    "content": "shore. The profile of water temperature from the XBT transect extended",
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                    ]
                },
                {
                    "content": "in a southwesterly direction for about 100 miles from Scripps Pier.",
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                    ]
                },
                {
                    "content": "Since the water temperature at Scripps Pier had warmed to 65º F (18.3º C)",
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                {
                    "content": "by August 7, the conditions that existed on August 5, were no longer in",
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                    "content": "evidence on August 15 when the XBT transect was conducted.",
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                },
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                    "content": "In spite of this the XBT data does indicate the reason for the cold",
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                },
                {
                    "content": "water intrusion. The temperature profile shows that a very shallow (5 m)",
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                    "content": "and sharp (4º C/5 m) thermocline existed in the nearshore region. The",
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                    "content": "thermocline became deeper and weaker with increasing distance from the",
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                    "content": "shore till it reached a depth of some 25 m in the offshore area. It is",
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                    "content": "clear from the section that only a very small northerly component of sur-",
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                    "content": "face wind would have been necessary under these circumstances to cause",
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                    "content": "the upwelling of colder waters into the surface nearshore zone. This",
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                    "content": "condition may have been enhanced by the mixing of deeper waters from",
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                },
                {
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                    "content": "of the fishes of Magdalena Bay, Baja California, and will begin a manu-",
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                    "content": "script of this study before returning to Humboldt State University this",
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                    "content": "The three authors, Dr. Ahlstrom, Mr. John Butler, and Ms. Barbara",
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                    "content": "the eastern Pacific, kind, distributions, and early life histories\" are",
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                    "content": "busy editing the text, and striving for consistency in presentation of",
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                    "content": "RECREATIONAL FISHERIES",
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                    "content": "the anchovy research programs in California to date. These documents",
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                    "content": "include 1) a list and location of available data, with samples, 2) des-",
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                    "content": "with",
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                    "content": "the",
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                    "content": "larval",
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            "lines": [
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                {
                    "content": "Preliminary Stock Recruitment Model for",
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                    "content": "Northern Anchovy Developed",
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                {
                    "content": "Mr. MacCall and Dr. Stauffer this month developed a preliminary",
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                {
                    "content": "stock recruitment model for the northern anchovy population from avail-",
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                {
                    "content": "able abundance estimates based on the larva index for years 1950 to",
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                {
                    "content": "1966. Recruitment to the spawning biomass for a given year was esti-",
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                {
                    "content": "mated from the larva index of that year minus the index of the previous",
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                {
                    "content": "year x 0.44, the average resulting change in spawning biomass after a",
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                    "content": "year of growth and natural mortality. The scatter of data points is",
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                    "content": "typical of stock recruitment relationships although it appears that a",
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                    "content": "Ricker-type curve fits the data. The analysis indicates that recruit-",
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                {
                    "content": "ment to the spawning biomass was exceptional in 1962, 1963, and 1965.",
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                {
                    "content": "If anchovies spawn after 1 year, then one could conclude that conditions",
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                    "content": "for recruitment were better than average in 1961, 1962, and 1964.",
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                    "content": "Data on Growth and Mortality of Northern",
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                    "content": "Anchovy Stocks Reviewed",
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                    "content": "Mr. J. MacGregor, Fishery Biologist in the Recreational Fisheries",
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                {
                    "content": "Program at the La Jolla Laboratory, reviewed, and in some cases,",
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                    "content": "reanalyzed data on growth and mortality of the northern anchovy stocks.",
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                    "content": "The first step in applying fishery management models to the anchovy",
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                {
                    "content": "stocks is to compile, standardize, and analyze existing data. Such an",
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                    "content": "inventory of available data not only provides better statistics, but",
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                    "content": "also indicates what data should be collected in the future. The pri-",
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                    "content": "mary purpose of the review at this time is to evaluate the application",
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                {
                    "content": "of yield-per-recruit model to the anchovy stock in light of the",
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                {
                    "content": "expanding Mexican reduction fishery. A working paper is being pre-",
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                {
                    "content": "pared for the Fourth Anchovy Workshop scheduled for January 1976 at",
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                },
                {
                    "content": "the SWFC.",
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                {
                    "content": "Mr. MacGregor also completed the final revisions on a paper",
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                {
                    "content": "entitled \"Ovarian development and fecundity of five species of",
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                },
                {
                    "content": "California Current fishes.\" The paper, scheduled for publication in",
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                {
                    "content": "CalCOFI Reports, Vol. 18, was returned to the editor.",
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                    "content": "STOCK AND RECRUITMENT",
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                    "content": "Environmental Studies of the Larval Anchovy's",
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                    "content": "Feeding Regime Summarized",
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                    "content": "Early this month Dr. R. Lasker, Chief of the Coastal Fisheries",
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                    "content": "Resources Division at the La Jolla Laboratory, met with scientists at",
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                    "content": "the Brookhaven National Laboratory to discuss the future of the larval",
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                    "content": "in the Los Angeles Bight and the California Current. In preparation",
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                    "content": "larval anchovy in the Los Angeles Bight\" in which he showed that the",
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                    "content": "advent of storm systems and turbulent mixing of the upper 100 m during",
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                    "content": "Congress, Dr. Lasker predicted that the 1975 anchovy year-class should",
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                    "content": "be a relatively poor one.",
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                    "content": "At Dr. Lasker's request, Mr. J. Brown, in preparation for the micro-",
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                    "content": "stratification cruise to be undertaken in March 1976, has been developing",
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                    "content": "models and after testing found one that can be used with an underwater",
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                    "content": "pumping system to be superior. Mr. Brown is currently investigating the",
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                    "content": "in the Ecology of Northern Anchovy Larvae",
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                    "content": "Dr. J. Hunter, Fishery Biologist, and Ms. C. Sanchez, Physical",
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                            "offset": 45188,
                            "length": 72
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                    ]
                },
                {
                    "content": "that they do not secrete gas into the swim bladder. Thus it is quite",
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                    ]
                },
                {
                    "content": "possible that larval anchovy may swim to the surface at night to fill",
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                    ]
                },
                {
                    "content": "their swim bladder. This hypothesis prompted an examination of the",
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                            "offset": 45400,
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                        }
                    ]
                },
                {
                    "content": "vertical distribution data for larval anchovy collected by Ahlstrom",
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                            "offset": 45467,
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                    ]
                },
                {
                    "content": "(1959), and from Ahlstrom's unpublished data from the same study.",
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                    ]
                },
                {
                    "content": "The vertical distribution of anchovy is summarized below for all of",
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                            "offset": 45601,
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                    ]
                },
                {
                    "content": "his collections combined. In the night collections one station (5504-",
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                    ]
                },
                {
                    "content": "120.50) had many more larvae than the rest but if it is deleted the",
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                },
                {
                    "content": "trends remain essentially unchanged.",
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                            "offset": 45807,
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                    ]
                },
                {
                    "content": "Examination of the table suggests that the larger larvae may mi-",
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                            "offset": 45844,
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                    ]
                },
                {
                    "content": "grate vertically, swimming to the surface waters at night. The data",
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                        {
                            "offset": 45909,
                            "length": 67
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                    ]
                },
                {
                    "content": "for larger larvae captured in the day is based on only 14 larvae so",
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                    ]
                },
                {
                    "content": "this still remains speculative.",
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                    "spans": [
                        {
                            "offset": 46045,
                            "length": 31
                        }
                    ]
                },
                {
                    "content": "Vertical distribution of anchovy larvae",
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                    "spans": [
                        {
                            "offset": 46077,
                            "length": 39
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                    ]
                },
                {
                    "content": "(from Ahlstrom, 1959, and unpublished data).",
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                    ]
                },
                {
                    "content": "Percent",
                    "polygon": [
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                            "offset": 46162,
                            "length": 7
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                    ]
                },
                {
                    "content": "Percent",
                    "polygon": [
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                        5.3507,
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                        4.9844,
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                    "spans": [
                        {
                            "offset": 46170,
                            "length": 7
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                    ]
                },
                {
                    "content": "Depth m",
                    "polygon": [
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                    "spans": [
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                            "offset": 46178,
                            "length": 7
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                    ]
                },
                {
                    "content": "Larvae",
                    "polygon": [
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                    "spans": [
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                            "offset": 46186,
                            "length": 6
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                    ]
                },
                {
                    "content": "Day",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 46193,
                            "length": 3
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                    ]
                },
                {
                    "content": "< 11.75 mm",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "Night",
                    "polygon": [
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                    "spans": [
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                            "length": 5
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                    ]
                },
                {
                    "content": "Larvae",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "Day",
                    "polygon": [
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                            "length": 3
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                    ]
                },
                {
                    "content": "≥ 11.75 mm",
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                            "offset": 46225,
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                    ]
                },
                {
                    "content": "Night",
                    "polygon": [
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                            "offset": 46236,
                            "length": 5
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                    ]
                },
                {
                    "content": "2",
                    "polygon": [
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                    "spans": [
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                            "offset": 46242,
                            "length": 1
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                    ]
                },
                {
                    "content": "2.1",
                    "polygon": [
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                    "spans": [
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                },
                {
                    "content": "26.6",
                    "polygon": [
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                },
                {
                    "content": "0",
                    "polygon": [
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                            "offset": 46253,
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                    ]
                },
                {
                    "content": "38.4",
                    "polygon": [
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                },
                {
                    "content": "8",
                    "polygon": [
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                    "spans": [
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                },
                {
                    "content": "42.7",
                    "polygon": [
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                },
                {
                    "content": "28.3",
                    "polygon": [
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                    "content": "7.0",
                    "polygon": [
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                {
                    "content": "27.2",
                    "polygon": [
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                    "content": "19",
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                    "content": "5.1",
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                    "content": "16.3",
                    "polygon": [
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                    "content": "7.0",
                    "polygon": [
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                    "content": "13.6",
                    "polygon": [
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                    "content": "28",
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                    "content": "45.0",
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                    "content": "8.1",
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                    "content": "28.6",
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                    "content": "16.8",
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                    "content": "41",
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                    "content": "4.5",
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                    "content": "12.1",
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                    "content": "The squid Loligo opalescens was raised by Dr. Hurley in the labora-",
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                    "content": "tory to a maximum age of 100 days on a diet of Artemia nauplii and adults.",
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                    "content": "per month. Respiration rates were obtained at 15º C for squid of three",
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                    "content": "of Pacific sardine, northern anchovy and jack mackerel taken in CalCOFI",
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                    "content": "ing incidence of the larvae of these three important California Current",
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                    "content": "stages of several species of the genus Engraulis is noted. This decline",
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                    "content": "Daily Rings in Anchovy Otoliths Investigated",
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                    "content": "been learning and developing techniques for removing, mounting, and",
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                    "content": "Pacific mackerel and jack mackerel reared in the Southwest Fisheries",
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                    "content": "fishes (larvae, juveniles, and adults) collected in the field.",
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                    "content": "Mr. Kramer discovered this month, that in addition to the sagittae,",
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                    "content": "another pair of otoliths in most fishes, the asterisci, can also be read",
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                    "content": "for daily rings, thus providing a check on the counts made with the",
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                    "content": "sagittae. In many instances, when sagittae grow too thick for direct",
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                    "content": "er rate, can still be read without resorting to grinding or etching pro-",
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                    "content": "cedures.",
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                    "content": "Juvenile anchovy could not be collected by Mr. Kramer for daily",
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                    "content": "growth ring studies on the recent Jordan survey, August 5 to 15. How-",
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                    "content": "ever, arrangements have been made to obtain the desired sized fish from",
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                    "content": "the bait and young fish surveys conducted by California Department of",
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                    "content": "Fish and Game.",
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                    "content": "tory, is attempting to model the anchovy larva's behavior and environ-",
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                    "content": "ment using data obtained in the laboratory and at sea. Dr. Vlymen has",
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                    "content": "derived a closed form expression for the recurrence times of the attack",
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                    "content": "event from a Markov chain attack model. The attack rates found by the",
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                    "content": "model were identical to those observed by Dr. John Hunter for 4 to 5",
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                {
                    "content": "mm larvae feeding on high concentrations of food particles.",
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                    "content": "An estimation of the representative particle size distribution in",
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                    "content": "the Los Angeles Bight during the peak anchovy spawning season was made",
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                    "content": "from the recent Niskin bottle-Coulter Counter surveys of Dr. Richard",
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                    "content": "Eppley of the Scripps Institution of Oceanography. Analysis of the",
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                    "content": "data showed a remarkable fit by a hyperbolic size distribution. This",
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                    "content": "type of particle size distribution has been found to be particularly",
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                    "content": "ubiquitous in nature.",
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                    "content": "This distribution also allows calculation of a density function",
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                    "content": "for particle sizes and a concomitant mean particle size for any size",
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                    "content": "range. These averages are important in the model because anchovy lar-",
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                    "content": "vious cruises have located areas in the Los Angeles Bight where suffi-",
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                    "content": "larvae require larger food organisms in concentrations greater than 1/ml.",
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                    "content": "A Model \"A\" Coulter Counter has been modified so that it can be",
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                    "content": "used in a search for aggregations of particles at sea. Some of the",
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                    "content": "The plan is to pump water through a small diameter hose which will",
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                    "content": "An expanded program of porpoise research was started in late 1972",
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                    "content": "at the La Jolla Laboratory as a direct result of the passage of the",
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                    "content": "Marine Mammal Protection Act of 1972. The objective of the program",
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                    "content": "was to develop fishing methods and gear technology which would reduce",
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                    "content": "the incidental mortality of porpoises in the yellowfin tuna purse seine",
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                    "content": "fishery and to determine the status of the porpoise stocks associated",
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                    "content": "with the incidental mortality. As presently constituted the program",
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                    "content": "to accomplish this consists of three somewhat related components: 1)",
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                    "content": "mortality reduction technology, 2) general biology, ecology, and popu-",
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                    "content": "lation dynamics, and 3) data management and quantitative analysis.",
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                    "content": "The following is a summary of information contained in this progress",
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                    "content": "variety of gear and methods under charter to the NMFS. In addition,",
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                    "content": "the large volume purse seine net, apron, anti-torque cable, lengthened",
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                    "content": "current ribbons, and porpoise grabber received additional testing in",
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                    "content": "the U.S. purse seine fleet with the cooperation, participation, and",
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                    "content": "the net open prior to the execution of backing down and the use of",
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                    "content": "rescuers at the corkline. Technological developments that will re-",
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                    "content": "quire further testing and analysis but that are promising to reduce",
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                    "content": "the large volume purse seine, finer mesh Medina panels and use of fine",
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                    "content": "mesh in other areas of the nets, the porpoise apron, and the grabber.",
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                    "content": "A major paper on the general biology of the offshore spotted dol-",
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                    "content": "phin (Stenella attenuata), historically the species with the highest",
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                    "content": "mortality in the eastern Pacific tropical tuna fishery was completed.",
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                    "content": "porpoises and treated such matters as gestation period, fetal growth,",
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                    "content": "age determination, length-weight relationships, geographical variation,",
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                    "content": "etc. Biological research has since concentrated on the biology of the",
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                {
                    "content": "eastern spinner dolphin (Stenella longirostris subspecies), the species",
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                    "content": "ology of the common dolphin (Delphinus species), the species with the",
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                    "content": "third highest mortality, and the striped dolphin (Stenella coeruleoalba),",
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                    "content": "cult problems in porpoise biology, direct calibration of age, received",
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                    "content": "special attention when a contract was granted to Dr. Jeffrey Bada of",
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                    "content": "the University of California at San Diego, to apply his new technique",
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                    "content": "to aging mammals through biochemical analysis of dental protein.",
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                    "content": "Under the provisions of the Marine Mammal Act of 1972, and with",
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                    "content": "the cooperation of the U.S. tuna fleet, NMFS field technicians go to",
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                    "content": "sea aboard U.S. tuna purse seiners, where they count porpoises killed",
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                {
                    "content": "incidentally in the fishing operations, record statistics on size and",
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                    "content": "makeup of the catch, collect specimens to be used in studies of por-",
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                {
                    "content": "poise life histories and stock assessments, and make detailed observa-",
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                {
                    "content": "tions of the rescue operations during each tuna set, and make other",
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                    "content": "observations on cetaceans and birds. In 1975, the field technician",
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                    "content": "program, working cooperatively with the tuna industry completed 31",
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                    "content": "trips, which adequately covered the entire U.S. unregulated, yellow-",
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                    "content": "fin tuna fishing season within the CYRA.",
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                    "content": "Information derived from the field technician program is integrated",
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                    "content": "with data from an aerial survey and further treated statistically to",
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                    "content": "derive an estimation of porpoise stocks. Tentative conclusions of the",
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                    "content": "staff are that the stock of offshore spotted dolphins in the eastern",
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                    "content": "American Tropical Tuna Commission, the staff estimated that 72,000",
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                },
                {
                    "content": "general",
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                {
                    "content": "targets",
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                },
                {
                    "content": "(pinnipeds,",
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                },
                {
                    "content": "kelp",
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            ],
            "lines": [
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                    "content": "25",
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                    ]
                },
                {
                    "content": "estimate at present is that biologically, the population could sustain",
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                },
                {
                    "content": "an annual fishing mortality rate of 1.4 to 4.4%. There is no striking",
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                    ]
                },
                {
                    "content": "evidence that the stock is either increasing or decreasing.",
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                    ]
                },
                {
                    "content": "Similar estimates place the stock of eastern spinner dolphins in",
                    "polygon": [
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                    ]
                },
                {
                    "content": "the eastern Pacific at 1.1 to 1.2 million animals and the 1974 annual",
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                },
                {
                    "content": "rate of mortality caused by fishing at 1.8 to 1.9%. The best estimate",
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                    ]
                },
                {
                    "content": "at present is that, biologically, the population could sustain an",
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                },
                {
                    "content": "annual incidental fishing mortality of 2.8%. As with the spotted dolphin,",
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                },
                {
                    "content": "there is no striking evidence that the stock is either increasing or",
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                {
                    "content": "decreasing.",
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                    ]
                },
                {
                    "content": "Using data from 1973, 1974, and 1975, an evaluation of the U.S.",
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                    ]
                },
                {
                    "content": "tuna fleet's kill rate performance for 1975, under conditions compar-",
                    "polygon": [
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                    ]
                },
                {
                    "content": "able to previous years, was made. Tentative conclusions which were",
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                },
                {
                    "content": "made from the analysis of these data indicated that total porpoise",
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                },
                {
                    "content": "mortality from fishing in 1975 will probably be greater than 1974. The",
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                    ]
                },
                {
                    "content": "revised preliminary kill estimate for 1974 was 113,000 animals (98,000",
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                            "offset": 60237,
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                    ]
                },
                {
                    "content": "by U.S. vessels). The preliminary kill estimate for 1975 is 93,000 to",
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                    "spans": [
                        {
                            "offset": 60308,
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                    ]
                },
                {
                    "content": "214,000 animals. Using the same percentage as in 1974, the U.S. kill",
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                },
                {
                    "content": "for 1975 will probably be 81,000 to 186,000 animals. While it appears",
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                    ]
                },
                {
                    "content": "that the kill rate will be higher in 1975 than in 1974, analysis of the",
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                },
                {
                    "content": "data revealed that fishing conditions changed between 1974 and 1975",
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                },
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                    "content": "and that under similar conditions the kill rate in 1975 would have been",
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                },
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                    "content": "22% lower than in 1974.",
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                {
                    "content": "NASA Cooperation Permits Evaluation of",
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                    "content": "Aircraft for Porpoise Surveys",
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                    "content": "On August 13, 1975, the Bering Sea Marine Mammal Experiment",
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                    "content": "(BESMEX) and the Arctic Ice Dynamics Experiment (AIDEX) flew their",
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                {
                    "content": "remote sensing systems checkout mission aboard NASA's Galileo II.",
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                },
                {
                    "content": "At the request of the National Marine Fisheries Service, Mr. James",
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                    "content": "Coe, Fishery Biologist at the La Jolla Laboratory, was permitted to",
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                    "content": "observe this mission in order to form opinions on the feasibility of",
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                    "content": "employing Galileo II for porpoise survey work and to aid in the loca-",
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                    "content": "tion and filming of a school of porpoise.",
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                    "content": "Dr. G. Carlton Ray, Principal Investigator, BESMEX was very",
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                    "content": "interested in the problems of small cetacean survey and kindly agreed",
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                    "content": "to a major alteration of his mission's flight plan in the event that",
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                    "content": "a good target could be located. Before the flight, Mr. Coe was briefed",
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                    "content": "on the mission and acquainted with problems encountered in remote",
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                    "content": "sensing of animal populations in general.",
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                    "content": "The BESMEX segment of the mission was to consist of four east/",
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                    "content": "to San Miguel Island at an altitude of 3,000 feet and an air speed of",
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                {
                    "content": "from 3,000, 5,000, 10,000, and possibly 15,000 feet.",
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                    "content": "Unfortunately, low stratus clouds from 1,500 to 2,500 feet pre-",
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                    "content": "cluded flying the intended tracks. Instead the aircraft was led through",
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                    "content": "some small openings in the cloud cover and parts of San Miguel and Santa",
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                    "content": "Rosa Islands and the surrounding waters were scanned using the KS-87",
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                {
                    "content": "camera and the IR imager. The RC-8- x 9-inch film format camera system",
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                {
                    "content": "was inoperable below 3,000 feet due to target motion. A school of about",
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                    "content": "1,000 to 2,000 Delphinus sp. were sighted about 5 miles south of San",
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                    "content": "Miguel Island and four passes were made over the school from an altitude",
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                    "content": "of about 1,500 feet using the motion compensated KS-87 camera and the",
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                    "content": "IR imager.",
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                    "content": "Mr. Coe was subsequently informed that cursory examination of the",
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                    "content": "segments of the film exposed over the porpoise school revealed nothing.",
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                    "content": "This may have been because the porpoises submerged as the aircraft ap-",
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                    "content": "proached or they may simply have been missed. The IR scanner tapes also",
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                    "content": "showed nothing from the porpoise school either, but this may have been",
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                    "content": "due to the magnitude of temperature differential which the scanner was",
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                {
                    "content": "set to detect (20° C) and that IR sensing may be a useful tool in small",
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                {
                    "content": "cetacean survey work. In summary, Mr. Coe is of the opinion that the",
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                    "content": "Convair 990, specifically the Galileo II, is not suitable for visual",
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                    "content": "survey work. He recommended, however, that NOAA/NMFS should now define",
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                    "content": "its survey/sensing needs. Since BESMEX and NASA are cooperative and",
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                {
                    "content": "interested, it may be possible to examine NASA's extensive capabilities",
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                    "content": "in this area for porpoise surveys in the future.",
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                    "content": "TUNA RESOURCES",
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                    "content": "Preparations Continue for ICCAT Meeting",
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                    "content": "Each year the Standing Committee on Research and Statistics (SCRS)",
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                    "content": "of the International Commission for the Conservation of Atlantic Tunas",
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                    "content": "( ICCAT) meet to evaluate the status of the Atlantic tuna stocks and to",
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                    "content": "advise the Commission on scientific matters relating to the conservation",
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                    "content": "of the stocks. This year the SCRS will meet during November 12-18 in",
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                    "content": "Madrid, Spain. Current Chairman of the SCRS is Dr. Brian Rothschild,",
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                    "content": "Director of the Southwest Fisheries Center.",
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                    "content": "tory, headed by Acting Leader, Dr. Gary Sakagawa, is planning to submit",
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                        2.5782,
                        6.886,
                        2.2314,
                        6.886
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                    "span": {
                        "offset": 66022,
                        "length": 4
                    }
                },
                {
                    "content": "310",
                    "polygon": [
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                        6.74,
                        3.6515,
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                        6.8906
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                    "span": {
                        "offset": 66027,
                        "length": 3
                    }
                },
                {
                    "content": "87",
                    "polygon": [
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                    "confidence": 0.998,
                    "span": {
                        "offset": 66031,
                        "length": 2
                    }
                },
                {
                    "content": "397",
                    "polygon": [
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                        6.7537,
                        6.1376,
                        6.8952,
                        5.8775,
                        6.8952
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                    "confidence": 0.994,
                    "span": {
                        "offset": 66034,
                        "length": 3
                    }
                },
                {
                    "content": "1975",
                    "polygon": [
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                        7.0731,
                        2.5782,
                        7.2146,
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                    "confidence": 0.992,
                    "span": {
                        "offset": 66038,
                        "length": 4
                    }
                },
                {
                    "content": "268",
                    "polygon": [
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                        7.0777,
                        3.6506,
                        7.2122,
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                    "confidence": 0.998,
                    "span": {
                        "offset": 66043,
                        "length": 3
                    }
                },
                {
                    "content": "38",
                    "polygon": [
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                        7.0777,
                        4.8988,
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                    "confidence": 0.999,
                    "span": {
                        "offset": 66047,
                        "length": 2
                    }
                },
                {
                    "content": "306",
                    "polygon": [
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                        7.0823,
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                    "confidence": 0.998,
                    "span": {
                        "offset": 66050,
                        "length": 3
                    }
                },
                {
                    "content": "Percent",
                    "polygon": [
                        2.2335,
                        7.4175,
                        2.8247,
                        7.4181,
                        2.8247,
                        7.5505,
                        2.2335,
                        7.5523
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                    "confidence": 0.996,
                    "span": {
                        "offset": 66054,
                        "length": 7
                    }
                },
                {
                    "content": "Change",
                    "polygon": [
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                        2.7425,
                        7.5819,
                        2.7425,
                        7.7394,
                        2.2373,
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                    "confidence": 0.999,
                    "span": {
                        "offset": 66062,
                        "length": 6
                    }
                },
                {
                    "content": "-13.6%",
                    "polygon": [
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                        7.5763,
                        3.6506,
                        7.7131,
                        3.1427,
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                    "confidence": 0.996,
                    "span": {
                        "offset": 66069,
                        "length": 6
                    }
                },
                {
                    "content": "-56.3%",
                    "polygon": [
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                        4.8964,
                        7.5785,
                        4.8964,
                        7.7239,
                        4.3935,
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                    "confidence": 0.996,
                    "span": {
                        "offset": 66076,
                        "length": 6
                    }
                },
                {
                    "content": "-22.9%",
                    "polygon": [
                        5.6292,
                        7.5817,
                        6.1376,
                        7.5797,
                        6.1376,
                        7.7257,
                        5.6263,
                        7.7253
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                    "confidence": 0.993,
                    "span": {
                        "offset": 66083,
                        "length": 6
                    }
                },
                {
                    "content": "January-July",
                    "polygon": [
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                        4.6682,
                        8.0771,
                        3.6386,
                        8.0686
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                    "confidence": 0.992,
                    "span": {
                        "offset": 66090,
                        "length": 12
                    }
                },
                {
                    "content": "1974",
                    "polygon": [
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                        2.5737,
                        8.3713,
                        2.2406,
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                    "confidence": 0.989,
                    "span": {
                        "offset": 66103,
                        "length": 4
                    }
                },
                {
                    "content": "1,815",
                    "polygon": [
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                    "confidence": 0.994,
                    "span": {
                        "offset": 66108,
                        "length": 5
                    }
                },
                {
                    "content": "340",
                    "polygon": [
                        4.618,
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                        8.2322,
                        4.8918,
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                        4.618,
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                    "confidence": 0.998,
                    "span": {
                        "offset": 66114,
                        "length": 3
                    }
                },
                {
                    "content": "2.155",
                    "polygon": [
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                        6.133,
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                    "confidence": 0.997,
                    "span": {
                        "offset": 66118,
                        "length": 5
                    }
                },
                {
                    "content": "1975",
                    "polygon": [
                        2.236,
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                        8.5654,
                        2.5737,
                        8.7068,
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                    "confidence": 0.992,
                    "span": {
                        "offset": 66124,
                        "length": 4
                    }
                },
                {
                    "content": "2,221",
                    "polygon": [
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                        8.5699,
                        3.6287,
                        8.7182,
                        3.2171,
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                    "confidence": 0.984,
                    "span": {
                        "offset": 66129,
                        "length": 5
                    }
                },
                {
                    "content": "432",
                    "polygon": [
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                        4.8873,
                        8.5699,
                        4.8873,
                        8.709,
                        4.6272,
                        8.7114
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                    "confidence": 0.998,
                    "span": {
                        "offset": 66135,
                        "length": 3
                    }
                },
                {
                    "content": "2,653",
                    "polygon": [
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                        6.133,
                        8.5699,
                        6.133,
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                        8.7205
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                    "confidence": 0.996,
                    "span": {
                        "offset": 66139,
                        "length": 5
                    }
                },
                {
                    "content": "Percent",
                    "polygon": [
                        2.2392,
                        8.9142,
                        2.8201,
                        8.9189,
                        2.8195,
                        9.049,
                        2.2334,
                        9.048
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                    "confidence": 0.992,
                    "span": {
                        "offset": 66145,
                        "length": 7
                    }
                },
                {
                    "content": "Change",
                    "polygon": [
                        2.2355,
                        9.0836,
                        2.738,
                        9.084,
                        2.7372,
                        9.2407,
                        2.2355,
                        9.2405
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                    "confidence": 0.999,
                    "span": {
                        "offset": 66153,
                        "length": 6
                    }
                },
                {
                    "content": "+22.4%",
                    "polygon": [
                        3.1436,
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                        3.6415,
                        9.0746,
                        3.6415,
                        9.2189,
                        3.1396,
                        9.2225
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                    "confidence": 0.994,
                    "span": {
                        "offset": 66160,
                        "length": 6
                    }
                },
                {
                    "content": "+27.06%",
                    "polygon": [
                        4.3015,
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                        9.0784,
                        4.8964,
                        9.2204,
                        4.2934,
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                    "confidence": 0.995,
                    "span": {
                        "offset": 66167,
                        "length": 7
                    }
                },
                {
                    "content": "+23.1%",
                    "polygon": [
                        5.6253,
                        9.0811,
                        6.1375,
                        9.076,
                        6.1376,
                        9.2225,
                        5.6254,
                        9.2197
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                    "confidence": 0.995,
                    "span": {
                        "offset": 66175,
                        "length": 6
                    }
                }
            ],
            "lines": [
                {
                    "content": "27",
                    "polygon": [
                        4.0796,
                        0.5248,
                        4.2484,
                        0.5293,
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                    "spans": [
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                            "offset": 64733,
                            "length": 2
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                    ]
                },
                {
                    "content": "of tropical tunas caught by the U.S. fleet, status of the skipjack",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 64736,
                            "length": 66
                        }
                    ]
                },
                {
                    "content": "tuna stocks, status of the bigeye tuna stocks, and size composition",
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                    ]
                },
                {
                    "content": "of yellowfin and skipjack tunas caught by all fleets in the Atlantic.",
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                },
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                    "content": "Documents on the status of the yellowfin tuna stocks are scheduled",
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                    "spans": [
                        {
                            "offset": 64941,
                            "length": 66
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                    ]
                },
                {
                    "content": "for completion and submission to the SCRS.",
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                        4.9055,
                        1.766,
                        4.9055,
                        1.9212,
                        1.4374,
                        1.9029
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                    "spans": [
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                            "offset": 65008,
                            "length": 42
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                    ]
                },
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                    "content": "First Working Versions of Computer Data",
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                        2.4186,
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                    "content": "Base for Atlantic Tunas Completed",
                    "polygon": [
                        1.4283,
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                        4.18,
                        2.4231,
                        4.18,
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                    "content": "The first working versions of catch and length-frequency computer",
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                    "content": "data bases for Atlantic tunas were completed by Mathematician A. Coan",
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                    ]
                },
                {
                    "content": "and Fishery Biologists G. Sakagawa and T. Murphy at the La Jolla Labora-",
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                        {
                            "offset": 65261,
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                    ]
                },
                {
                    "content": "tory. The catch data base contains all catches of Atlantic tunas, by",
                    "polygon": [
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                        7.1506,
                        3.5913,
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                    "spans": [
                        {
                            "offset": 65334,
                            "length": 68
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                    ]
                },
                {
                    "content": "country, for 1960-73. The length-frequency data base contains length",
                    "polygon": [
                        1.4192,
                        3.5731,
                        7.1552,
                        3.5913,
                        7.1506,
                        3.7556,
                        1.4192,
                        3.7282
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                    "spans": [
                        {
                            "offset": 65403,
                            "length": 68
                        }
                    ]
                },
                {
                    "content": "frequencies of skipjack, yellowfin, and bigeye tunas by gear, month,",
                    "polygon": [
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                        3.7647,
                        7.0502,
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                    "spans": [
                        {
                            "offset": 65472,
                            "length": 68
                        }
                    ]
                },
                {
                    "content": "and ocean region where catches were made. Current plans are to expand",
                    "polygon": [
                        1.4192,
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                        3.929,
                        7.2373,
                        4.0979,
                        1.4192,
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                        {
                            "offset": 65541,
                            "length": 69
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                    ]
                },
                {
                    "content": "and update the data bases, and use the bases as integral components in",
                    "polygon": [
                        1.41,
                        4.075,
                        7.2328,
                        4.0933,
                        7.2328,
                        4.2667,
                        1.41,
                        4.2439
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                    "spans": [
                        {
                            "offset": 65611,
                            "length": 70
                        }
                    ]
                },
                {
                    "content": "future studies on tuna stock assessment.",
                    "polygon": [
                        1.4192,
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                        4.7184,
                        4.253,
                        4.7184,
                        4.4082,
                        1.4192,
                        4.3899
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                    "spans": [
                        {
                            "offset": 65682,
                            "length": 40
                        }
                    ]
                },
                {
                    "content": "Tuna Vessels Participate in FAX Program",
                    "polygon": [
                        1.41,
                        4.7413,
                        4.6682,
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                        4.6682,
                        4.9147,
                        1.41,
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                    "spans": [
                        {
                            "offset": 65723,
                            "length": 39
                        }
                    ]
                },
                {
                    "content": "During August a total of 29 U.S. seiners participated in the FAX",
                    "polygon": [
                        1.8207,
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                        5.2569,
                        7.1369,
                        5.4212,
                        1.8207,
                        5.403
                    ],
                    "spans": [
                        {
                            "offset": 65763,
                            "length": 64
                        }
                    ]
                },
                {
                    "content": "program of the La Jolla Laboratory. Reporting rates for August 1975",
                    "polygon": [
                        1.41,
                        5.4212,
                        7.0548,
                        5.4304,
                        7.0548,
                        5.5946,
                        1.41,
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                    "spans": [
                        {
                            "offset": 65828,
                            "length": 67
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                    ]
                },
                {
                    "content": "were down from August of 1974 by about 23% as shown below.",
                    "polygon": [
                        1.4009,
                        5.5855,
                        6.2015,
                        5.5901,
                        6.2015,
                        5.7498,
                        1.4009,
                        5.7361
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                        {
                            "offset": 65896,
                            "length": 58
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                    ]
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                {
                    "content": "August Reporting Rates",
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                        5.0561,
                        6.0829,
                        3.2217,
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                    "spans": [
                        {
                            "offset": 65955,
                            "length": 22
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                    ]
                },
                {
                    "content": "Weather",
                    "polygon": [
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                        3.8103,
                        6.2517,
                        3.8103,
                        6.3886,
                        3.2217,
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                    "spans": [
                        {
                            "offset": 65978,
                            "length": 7
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                    ]
                },
                {
                    "content": "observations",
                    "polygon": [
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                        6.4206,
                        4.0613,
                        6.4206,
                        4.0613,
                        6.5666,
                        3.062,
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                    "spans": [
                        {
                            "offset": 65986,
                            "length": 12
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                    ]
                },
                {
                    "content": "XBT",
                    "polygon": [
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                        6.2426,
                        4.8964,
                        6.2472,
                        4.8918,
                        6.3932,
                        4.6317,
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                    "spans": [
                        {
                            "offset": 65999,
                            "length": 3
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                    ]
                },
                {
                    "content": "observations",
                    "polygon": [
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                        6.4206,
                        5.3025,
                        6.5621,
                        4.3032,
                        6.5666
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                    "spans": [
                        {
                            "offset": 66003,
                            "length": 12
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                    ]
                },
                {
                    "content": "Total",
                    "polygon": [
                        5.7086,
                        6.416,
                        6.1193,
                        6.4115,
                        6.1193,
                        6.5621,
                        5.7086,
                        6.5621
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                    "spans": [
                        {
                            "offset": 66016,
                            "length": 5
                        }
                    ]
                },
                {
                    "content": "1974",
                    "polygon": [
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                        6.7355,
                        2.5691,
                        6.8815,
                        2.2314,
                        6.886
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                    "spans": [
                        {
                            "offset": 66022,
                            "length": 4
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                    ]
                },
                {
                    "content": "310",
                    "polygon": [
                        3.3951,
                        6.74,
                        3.6506,
                        6.74,
                        3.6506,
                        6.8906,
                        3.3905,
                        6.8906
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                    "spans": [
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                            "offset": 66027,
                            "length": 3
                        }
                    ]
                },
                {
                    "content": "87",
                    "polygon": [
                        4.7093,
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                        4.8918,
                        6.74,
                        4.8918,
                        6.8952,
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                        6.8997
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                    "spans": [
                        {
                            "offset": 66031,
                            "length": 2
                        }
                    ]
                },
                {
                    "content": "397",
                    "polygon": [
                        5.8775,
                        6.7537,
                        6.133,
                        6.7537,
                        6.1285,
                        6.8952,
                        5.8775,
                        6.8952
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                    "spans": [
                        {
                            "offset": 66034,
                            "length": 3
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                    ]
                },
                {
                    "content": "1975",
                    "polygon": [
                        2.2406,
                        7.0731,
                        2.5737,
                        7.0731,
                        2.5646,
                        7.2146,
                        2.2406,
                        7.2146
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                        {
                            "offset": 66038,
                            "length": 4
                        }
                    ]
                },
                {
                    "content": "268",
                    "polygon": [
                        3.3905,
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                        3.646,
                        7.0777,
                        3.646,
                        7.2146,
                        3.3905,
                        7.2146
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                    "spans": [
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                            "offset": 66043,
                            "length": 3
                        }
                    ]
                },
                {
                    "content": "38",
                    "polygon": [
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                        7.0777,
                        4.8918,
                        7.2237,
                        4.7139,
                        7.2192
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                            "offset": 66047,
                            "length": 2
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                    ]
                },
                {
                    "content": "306",
                    "polygon": [
                        5.8775,
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                    "content": "28",
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                    "content": "foreign fishing inside the Commission Yellowfin Regulatory Area (CYRA).",
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                    "content": "Most of these seiners are cooperating vessels that collect expendable",
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                    "content": "C, again led cooperating vessels in August with 45 weather observations",
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                    "content": "sent by radio to the Southwest Fisheries Center.",
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                    "content": "investigating the relationship between fishing success and environ-",
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                    "content": "liminary analysis with data for the first 3 months of the 1973 fishing",
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                    "content": "probability are significantly correlated with such environmental para-",
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                    "content": "meters as wind speed, cloud cover, wave height, swell height, sea sur-",
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                    "content": "analyses with a longer series of data are in progress.",
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                    "content": "TIBURON LABORATORY",
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                    "content": "COASTAL FISH COMMUNITIES INVESTIGATIONS",
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                    "content": "Assessments of Food Available to Nearshore Fishes",
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                    "content": "Island, California. This month they completed the last, and most complex,",
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                    "content": "of the six representative habitats under study -- the kelp (Macrocystis)",
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                    "content": "fact consumed as food.",
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                    "content": "to another. During the transfer a videotape system was used to monitor",
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                    "content": "the number of fish being moved. Although results were not spectacular,",
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                    "content": "the system holds some promise of being useful for counting fish.",
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                    "content": "Anglers' Guide Approved by Center Director",
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                    "content": "after it was returned from reviewer Dan Miller of the CF&G and his",
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                    "content": "suggestions incorporated. Happily, there were few changes. After",
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                    "content": "these have been corrected by the typist, authors Jim Squire, Fishery",
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                    "content": "Biologist at La Jolla, and Susan Smith, Publications Specialist at",
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                    "content": "Tiburon, plan to submit the manuscript to NMFS Scientific Editor,",
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                    "content": "Dr. Bruce Collette, around the first of September.",
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                    "content": "The Guide described marine game fish, fishing grounds, and angler",
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                    "content": "facilities all along the U.S. West Coast (California, Oregon, Washington,",
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                },
                {
                    "content": "and Alaska), and around the tropical islands of Hawaii, American Samoa,",
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                {
                    "content": "and Guam.",
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                    "content": "PHYSIOLOGY INVESTIGATIONS",
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                    "content": "Staff Gears Up for Striped Bass Program;",
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                    "content": "mono-aromatic hydrocarbons on fish. Most manuscripts are now in the",
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                    "content": "for the new striped bass program.",
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                    "content": "PUBLIC RELATIONS - SOUTHWEST FISHERIES CENTER",
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                    "content": "High School, San Pedro, California, visited the Center",
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                    "content": "of Natural History.",
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                    "content": "Honolulu Laboratory",
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                    "content": "at Oregon State University, Corvallis, Oregon, where he",
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                    "content": "cal predation and fisheries exploitation.\"",
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                    "content": "18",
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                    "content": "James Cook.",
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                    "content": "the California Department of Fish and Game's survey boat",
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                    "content": "on a trip to the Sacramento-San Joaquin Delta area to deter-",
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                    "content": "min natural spawning and nursery areas of striped bass.",
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                    "content": "in Vancouver, B.C. consisted of Drs. B. Rothschild, M. Laurs,",
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                    "content": "framework of contemporary fishery regimes.\" The papers pre-",
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                    "content": "sources of the Pacific with Dr. Robert Kearney of the South",
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                    "content": "Mr.",
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                    "content": "tory, attended a Civil Service Commission course on \"Techni-",
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                    "content": "Computer Technician, La Jolla Laboratory, each received",
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                {
                    "content": "cash awards of $260 for their contributions to the develop-",
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                {
                    "content": "ment of a data management system to edit data collected by",
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                    "content": "NMFS field technicians at sea on porpoise/tuna interactions.",
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            "content": "EN NT OF COM"
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            "content": "PAR"
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            "content": "MERCE"
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            "content": "UNITED"
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                    "offset": 30,
                    "length": 6
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            "content": "MERICA"
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            ],
            "content": "STATES OF AM"
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            ],
            "content": "HONOLULU"
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                    "offset": 59,
                    "length": 8
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            ],
            "content": "LA JOLLA"
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                    "length": 7
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            ],
            "content": "TIBURON"
        },
        {
            "spans": [
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                    "length": 26
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            ],
            "content": "SOUTHWEST FISHERIES CENTER"
        },
        {
            "spans": [
                {
                    "offset": 103,
                    "length": 28
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            ],
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            ],
            "content": "MONTHLY REPORT - AUGUST 1975"
        },
        {
            "spans": [
                {
                    "offset": 132,
                    "length": 19
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            ],
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            ],
            "content": "RESEARCH HIGHLIGHTS"
        },
        {
            "spans": [
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                    "offset": 152,
                    "length": 82
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                }
            ],
            "content": "PAGE Fishery Statistics Calculated for the Albacore Fishery of the South Pacific 6"
        },
        {
            "spans": [
                {
                    "offset": 235,
                    "length": 128
                }
            ],
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                }
            ],
            "content": "Honolulu Laboratory Fishery Scientists Gather Data, Disseminate Information at 17th Hawaiian International Billfish Tournament 6"
        },
        {
            "spans": [
                {
                    "offset": 364,
                    "length": 84
                }
            ],
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            ],
            "content": "NOAA Research Vessel, Townsend Cromwell, Scouts for Hawaii's Missing Skipjack Tuna 7"
        },
        {
            "spans": [
                {
                    "offset": 449,
                    "length": 55
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            ],
            "content": "August Report From the Hawaiian Skipjack Tuna Fishery 7"
        },
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            ],
            "content": "Japanese Fishermen Recover Large Number of Albacore Tagged During Joint NMFS-AFRF Albacore Tagging Program 11"
        },
        {
            "spans": [
                {
                    "offset": 615,
                    "length": 104
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            ],
            "content": "Hydroacoustics Cruise Conducted off Los Angeles Bight Aboard NOAA Research Vessel, David Starr Jordan 12"
        },
        {
            "spans": [
                {
                    "offset": 720,
                    "length": 96
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            ],
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            ],
            "content": "La Jolla Laboratory Scientist Consults on Larval Fish Identification at Polish Sorting Center 14"
        },
        {
            "spans": [
                {
                    "offset": 817,
                    "length": 69
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            ],
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            ],
            "content": "Preliminary Stock Recruitment Model Developed for Northern 17 Anchovy"
        },
        {
            "spans": [
                {
                    "offset": 887,
                    "length": 56
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            ],
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            ],
            "content": "New Findings on Role of Swim Bladder in Northern Anchovy"
        },
        {
            "spans": [
                {
                    "offset": 944,
                    "length": 6
                }
            ],
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            ],
            "content": "Larvae"
        },
        {
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                    "offset": 951,
                    "length": 2
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            ],
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            ],
            "content": "18"
        },
        {
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            ],
            "content": "NMFS Report on Progress of Research on Porpoise Mortality Incidental to Tuna Purse Seine Fishing for Fiscal Year 1975 Released to Public . 23"
        },
        {
            "spans": [
                {
                    "offset": 1096,
                    "length": 86
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            ],
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            ],
            "content": "Assessments of Food Available to Nearshore Fishes in Representative Habitats Completed"
        },
        {
            "spans": [
                {
                    "offset": 1183,
                    "length": 9
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            ],
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            ],
            "content": "NOAA/NMFS"
        },
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                    "offset": 1193,
                    "length": 2
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            ],
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            ],
            "content": "28"
        },
        {
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                    "offset": 1196,
                    "length": 47
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            ],
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            ],
            "content": "SOUTHWEST FISHERIES CENTER LA JOLLA, CALIFORNIA"
        },
        {
            "spans": [
                {
                    "offset": 1244,
                    "length": 58
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            ],
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            ],
            "content": "HONOLULU LABORATORY LA JOLLA LABORATORY TIBURON LABORATORY"
        },
        {
            "spans": [
                {
                    "offset": 1303,
                    "length": 28
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            ],
            "content": "MONTHLY REPORT - AUGUST 1975"
        },
        {
            "spans": [
                {
                    "offset": 1332,
                    "length": 22
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                }
            ],
            "content": "STATUS OF PUBLICATIONS"
        },
        {
            "spans": [
                {
                    "offset": 1355,
                    "length": 9
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 2,
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            ],
            "content": "Published"
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        {
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                    "length": 137
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            ],
            "content": "Hobson, Edmund S. 1975. Marine animals hazardous to divers. In The NOAA Diving Manual, Chapter 15. Department of Commerce, 15-1 to 15-17."
        },
        {
            "spans": [
                {
                    "offset": 1503,
                    "length": 105
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 2,
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                }
            ],
            "content": "This is an account of the marine organisms that are poten- tial hazards to divers during NOAA operations."
        },
        {
            "spans": [
                {
                    "offset": 1609,
                    "length": 143
                }
            ],
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                }
            ],
            "content": "Kiefer, Dale A., and Reuben Lasker. 1975. Two blooms of Gymno- dinium splendens, an unarmored dinoflagellate. Fish. Bull., U.S. 73(3): 675-678."
        },
        {
            "spans": [
                {
                    "offset": 1753,
                    "length": 407
                }
            ],
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            ],
            "content": "This note reports upon two field studies of blooms of G. splen- dens, one in Coyote Bay of Bahia Concepcion, Gulf of California and the second in coastal waters of the Southern California Bight. In both occurrences G. splendens dominated the phyto- plankton crop so that measurements of primary production and the chemical composition of suspended particles allowed a reasonable description of this species."
        },
        {
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            ],
            "content": "Lasker, Reuben. 1975. Field criteria for survival of anchovy larvae: The relation between inshore chlorophyll maximum layers and successful first feeding. Fish. Bull., U.S. 73(3) : 453-462."
        },
        {
            "spans": [
                {
                    "offset": 2351,
                    "length": 246
                }
            ],
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            ],
            "content": "Northern anchovy larvae, Engraulis mordax, produced by labora- tory-spawned fish, have been used to detect concentrations of larval fish food in situ along the California coast. First- feeding larval anchovies, whose development was controlled by"
        },
        {
            "spans": [
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                    "offset": 2598,
                    "length": 1
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                }
            ],
            "content": "2"
        },
        {
            "spans": [
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                    "length": 1023
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            ],
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            ],
            "content": "temperature manipulation aboard ship, were placed in samples of Los Angeles Bight water taken from the surface and from chlorophyll maximum layers. Feeding by larvae in water from the surface was minimal in all experiments but extensive feed- ing occurred in water from the chlorophyll maximum layers when these contained phytoplankters having minimum diameters of ap- proximately 40 um and which occurred in densities of 20 to 40 particles/ml. In March and April 1974, the chlorophyll maximum layer along the California coast from Malibu to San Onofre (a distance of about 100 km) consisted chiefly of a bloom of the naked dinoflagellate Gymnodinium splendens, a food organism known to support growth in anchovy larvae. Copepod nauplii and nonliving particles were never in high enough concentration or of the proper size to be eaten by the larvae. A storm which caused extensive mixing of the top 20 m of water obliterated the chlorophyll maximum layer and effectively destroyed this feeding ground of the larval anchovy."
        },
        {
            "spans": [
                {
                    "offset": 3624,
                    "length": 321
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 3,
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                    ]
                }
            ],
            "content": "Otsu, Tamio. 1975. Results of tuna live bait transporting experi- ments of the Honolulu Laboratory (Honolulu Suisan Kenkyusho no saozuri ikie yuso shiken kekka). [In Jap.] Proceedings, 1974 Tuna Research Conference, Shimizu, Japan, February 4-6, 1975. Fisheries Agency, Far Seas Fisheries Research Laboratory, p. 239-243."
        },
        {
            "spans": [
                {
                    "offset": 3946,
                    "length": 170
                }
            ],
            "boundingRegions": [
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                    ]
                }
            ],
            "content": "Yong, Marian Y. Y., and Robert A. Skillman. 1975. A computer pro- gram for analysis of polymodal frequency distributions (ENORMSEP), FORTRAN IV. Fish. Bull., U.S. 73:681."
        },
        {
            "spans": [
                {
                    "offset": 4117,
                    "length": 424
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 3,
                    "polygon": [
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                    ]
                }
            ],
            "content": "Program ENORMSEP (Extended Normal Separator Program) separates a polymodal frequency distribution into its component groups where aging studies have not been performed. It calculates preliminary estimates of the number of size groups and their points of over- lap using probit analysis and polynomial regression techniques. A description of the program, with input and output for two examples, is available from the authors."
        },
        {
            "spans": [
                {
                    "offset": 4542,
                    "length": 27
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 3,
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                }
            ],
            "content": "Approved by Center Director"
        },
        {
            "spans": [
                {
                    "offset": 4570,
                    "length": 231
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 3,
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                    ]
                }
            ],
            "content": "\"Magnitude and ecological implications of thermal inertia in skip- jack tuna, Katsuwonus pelamis (Linnaeus)\" by William H. Neill, Randolph K. C. Chang, and Andrew E. Dizon. For publication in J. Exp. Mar. Biol. Ecol. (Netherlands)."
        },
        {
            "spans": [
                {
                    "offset": 4802,
                    "length": 84
                }
            ],
            "boundingRegions": [
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                        0.7978,
                        8.866
                    ]
                }
            ],
            "content": "\"Monitoring the ocean environment\" by L. E. Eber. For publication in Mar. Fish. Rev."
        },
        {
            "spans": [
                {
                    "offset": 4887,
                    "length": 116
                }
            ],
            "boundingRegions": [
                {
                    "pageNumber": 3,
                    "polygon": [
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                    ]
                }
            ],
            "content": "\"Anglers' Guide to the United States Pacific Coast\" by James L. Squire and Susan E. Smith. NMFS Special Publication."
        },
        {
            "spans": [
                {
                    "offset": 5004,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "3"
        },
        {
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                    "length": 19
                }
            ],
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                }
            ],
            "content": "HONOLULU LABORATORY"
        },
        {
            "spans": [
                {
                    "offset": 5026,
                    "length": 31
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "FISH ENVIRONMENT INVESTIGATIONS"
        },
        {
            "spans": [
                {
                    "offset": 5058,
                    "length": 581
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 4,
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                }
            ],
            "content": "The objective of the Honolulu Laboratory's Experimental Ecology of Tunas group is to measure directly the responses of tunas to environ- mental factors in order to realize a long-term goal of a predictive model of tuna habitat, distribution, and availability. During August, work has proceeded on experiments to measure or determine: 1) rates of heat exchange in yellowfin tuna, 2) the effectiveness of various natural odorants and odor constituents as stimulants to tunas, 3) feed- ing periodicity and maximum daily consumption of tunas, and 4) routine respiration rates of tunas."
        },
        {
            "spans": [
                {
                    "offset": 5640,
                    "length": 53
                }
            ],
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            ],
            "content": "Rates of Heat Exchange Tested in Seven Yellowfin Tuna"
        },
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            "spans": [
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                    "length": 1220
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "Mr. Minato Yasui, a graduate student from Tokai University, has tested seven yellowfin tuna to determine rates of temperature change and excess body temperatures. The results, contrasted with skipjack tuna, are as follows: 1) rates of temperature change were not marked- ly different from skipjack tuna of similar size, but 2) yellowfin tuna warmed more rapidly than they cooled by a factor of about 2. Skipjack tuna have resistances to heating or cooling that are the same. The difference between the two species may result from different tempera- ture coefficients for metabolic rate. Skipjack tuna have Q10's for routine metabolic rate near unity; yellowfin tuna have Q10's for meta- bolic rate probably between 2 and 3, which is comparable to that of other fish. As body temperature increases so does metabolic rate; the increased metabolic rate then contributes to faster rates of warm- ing. 3) However, no evidence of a relationship between excess tempera- ture of the red muscle and water temperature was discovered. Increased metabolic rate should result in a larger temperature excess. Perhaps the positive relationship between excess temperature and water tempera- ture was obscured by variability in the data."
        },
        {
            "spans": [
                {
                    "offset": 6915,
                    "length": 66
                }
            ],
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            ],
            "content": "Research Assistant Reports on Responses of Tunas to Olfactory Cues"
        },
        {
            "spans": [
                {
                    "offset": 6982,
                    "length": 417
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 4,
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                }
            ],
            "content": "Mr. Walter Ikehara, Research Assistant with the Hawaii Institute of Marine Biology, University of Hawaii, reports that various solutions of amino acids and derivatives have been made and are currently being tested on captive tunas. To date, glycine, hyproxy-proline, and tri- methyl amine HCl have not proven to be as effective a stimulus as natu- ral fish extracts. Cine-photographic analysis of the experiments will"
        },
        {
            "spans": [
                {
                    "offset": 7400,
                    "length": 1
                }
            ],
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            ],
            "content": "4"
        },
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            "spans": [
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                    "length": 135
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                }
            ],
            "content": "perhaps reveal more subtle distinctions. Work on responses of tunas to olfactory cues will continue until the end of the calendar year."
        },
        {
            "spans": [
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                    "offset": 7538,
                    "length": 70
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            ],
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            "content": "Feeding Periodicities and Maximum Daily Consumption of Tunas Monitored"
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            ],
            "content": "A small, mixed species school was used by Ms. Sherry Steffel to determine maximum daily consumption. Thawed smelt were cut in ~4-g pieces (3.5 to 4.9) and presented individually to the fish in the tank. The intake of each fish was monitored. Feeding schedules used were:"
        },
        {
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            ],
            "content": "1) One feeding to satiation/day, at 0900 (n = 5 days)."
        },
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            "content": "2) One feeding to satiation/day, at 1300 (n = 5 days)."
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            "content": "3) One feeding to satiation/day, at 1600 (n = 5 days)."
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            "content": "4) Continuous feeding (food was actually presented at 15 min. intervals, and fish were fed to satiation each time) (n = 10 days)."
        },
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            "content": "Preliminary results are as follows in table:"
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            "content": "Feeding"
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            "content": "Fish"
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            "content": "0900"
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            "content": "Percent body wt"
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            "content": "1300"
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            "content": "Percent body wt"
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            "content": "1600"
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            "content": "Percent body wt"
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            "content": "Continuous feeding"
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            "content": "Percent Body wt"
        },
        {
            "spans": [
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                    "offset": 8331,
                    "length": 26
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            ],
            "content": "Yellowfin 2.701 kg 52.2 cm"
        },
        {
            "spans": [
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                    "offset": 8358,
                    "length": 7
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            "content": "183.7 g"
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            "spans": [
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                    "length": 3
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            ],
            "content": "6.8"
        },
        {
            "spans": [
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                    "offset": 8370,
                    "length": 7
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            ],
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            ],
            "content": "200.0 g"
        },
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            "spans": [
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            "content": "7.4"
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            "content": "220.0 g"
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            "spans": [
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                    "length": 3
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            "content": "8.0"
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                    "length": 6
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            "content": "~380 g"
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            "content": "14"
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            "content": "Kawakawa 1.852 kg 45.9 cm"
        },
        {
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            "content": "132.9 g"
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            "content": "7.0"
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            "content": "119.3 g"
        },
        {
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                    "length": 3
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            "content": "6.4"
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            "content": "115.2 g"
        },
        {
            "spans": [
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                    "length": 3
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            "content": "6.2"
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            "content": "~240 g"
        },
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            "content": "13"
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            ],
            "content": "Skipjack 2.028 kg 49.0 cm"
        },
        {
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                    "offset": 8502,
                    "length": 2
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                }
            ],
            "content": "--"
        },
        {
            "spans": [
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                    "offset": 8505,
                    "length": 1
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            ],
            "boundingRegions": [
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            ],
            "content": "-"
        },
        {
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            "content": "--"
        },
        {
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                    "length": 1
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            "boundingRegions": [
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            ],
            "content": "-"
        },
        {
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                    "length": 7
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            ],
            "content": "119.5 g"
        },
        {
            "spans": [
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                    "length": 3
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            ],
            "content": "6.0"
        },
        {
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                    "length": 6
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            ],
            "content": "~425 g"
        },
        {
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                    "length": 2
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            ],
            "content": "21"
        },
        {
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            "content": "Skipjack 1.599 kg 45.0 cm"
        },
        {
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            ],
            "content": "163.8 g"
        },
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            ],
            "content": "10.2"
        },
        {
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            "content": "121.6 g"
        },
        {
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            "content": "7.6"
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            "content": "119.5 g"
        },
        {
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            "content": "7.5"
        },
        {
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            ],
            "content": "~320 g"
        },
        {
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            ],
            "content": "20"
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        {
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                }
            ],
            "content": "Fish did not begin feeding until dawn (0600 to 0615); fish usually stopped eating after dusk, and no fish ever accepted food after 1930. The values for percent body weight per day during continuous feeding indicate consistent performance, although values did range as high as 41% body weight per day on isolated occasions. The experiments utilizing"
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        {
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            "content": "5"
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                }
            ],
            "content": "one feeding to satiation per day indicate the maximum capacity of the stomach ranges from 6 to 10% of body weight."
        },
        {
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            ],
            "content": "At this time two additional mixed schools are undergoing feeding activity analysis. The second school has been tested at one feeding per day (0900 or 1600) and two feedings per day (0900 and 1300) and is currently receiving continuous food. The 0900 and 1300, 4-hour feeding regime was chosen because it has been previously determined that skip- jack tuna empty their stomachs by 50% in the first 4 hours after a meal. Therefore, food consumption when stomachs were empty (0900) and 50% full (1300) was of interest. The third school of fish is currently being moved to one feeding per day."
        },
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            "content": "Routine Respiration Rates Determined for Tunas Other Than Skipjack Tuna"
        },
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            ],
            "content": "After use in the preceding feeding experiment, fish were starved for 24 hours and individually tested by Mr. Thomas Byles to determine respiration rates. Values obtained for the yellowfin tuna were 0.584, 0.474, and 0.500 mg 02 g-1 hr-1 for three different replications; for the kawakawa were 0.865 and 1.078 mg 02 g-1 hr-1; and for a second kawakawa (47.0, 2.472 kg) were 0.539, 0.572, and 0.571 mg 02 g-1 hr-1. Elevation of respiration rate of the first kawakawa was probably caused by allowing oxygen levels to fall too low during the test. With skip- jack tuna, oxygen levels below about 4 ppm result in very increased activity levels which would elevate consumption rate."
        },
        {
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            ],
            "content": "Behavioral Thermoregulation Tank, Which Will Measure Temperature Preference of Tunas, Nears Completion"
        },
        {
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                }
            ],
            "content": "Progress has been made towards a fully operational behavioral thermo- regulation tank. The fiberglass box that holds the 24, 7.5 KVA heaters has now been encased in concrete, 6 inches thick. Mr. Randolph Chang did the masonry work. The box now withstands more than the necessary 15 psi pressure. Besides calibration of the system, all that remains is wiring of the heaters."
        },
        {
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                    "offset": 10889,
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            "content": "* *"
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            ],
            "content": "The rough draft of a manuscript, \"Swimming speed as a function of temperature in three species of tunas\" by A. E. Dizon and W. H. Neill has been completed and is undergoing revisions. Some of the results of the latter paper will be presented at the upcoming American Fisheries Society meeting by the senior author."
        },
        {
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            "content": "6"
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            ],
            "content": "Honolulu Laboratory Fishery Scientists Gather Data, Disseminate Information at 17th Hawaiian International Billfish Tournament"
        },
        {
            "spans": [
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                    "offset": 11337,
                    "length": 460
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            ],
            "content": "The 17th Hawaiian International Billfish Tournament was held in Kailua-Kona, Hawaii August 2 through 10. NMFS Fishery Biologist Heeny Yuen and Research Assistant Ray Sumida were in attendance. Mr. Yuen, ably assisted by Mr. Sumida, collected data on catch and effort in tournament areas; collected data on length, weight, and stomach con- tents; set up a NMFS display; participated in a seminar; and answered questions of tournament participants and followers."
        },
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            ],
            "content": "TUNA ASSESSMENT AND DEVELOPMENT INVESTIGATIONS"
        },
        {
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            ],
            "content": "Fishery Statistics Calculated for the Albacore Fishery of the South Pacific"
        },
        {
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            ],
            "content": "Dr. Robert Skillman, Leader of the Tuna Monitoring and Assessment Task, at the Honolulu Laboratory, completed the calculation of certain fishery statistics based on the generalized production model for the albacore fishery in the South Pacific. The calculation assumes that fishing would take place at the point of maximum sustainable yield and that the fleet would not materially change some of its operational char- acteristics, e.g., size of vessel, area of operations, and concentration on albacore. The fleet based in American Samoa would also continue to take 60% of the catch, as they have done in the past 10 years of the fishery."
        },
        {
            "spans": [
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            ],
            "content": "Specifically, it was estimated that 199 vessels could operate out of American Samoa, 112 out of other bases in the South Pacific, and 68 as Japanese sashimi-fishing vessels in the South Pacific annually. The American Samoa-based segment of the albacore fishing vessels could catch 0.55 MT (metric ton) of albacore per day and could spend 25,100 days fish- ing out of a total of 38,100 days out from port. These vessels could make a total of 546 trips per year. In the 69.8 days out from port per trip, they could spend 46.0 days fishing."
        },
        {
            "spans": [
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            "content": "Progress Reported in Work on \"Status\" Reports"
        },
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            "spans": [
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            "content": "Work is continuing at the Honolulu Laboratory on the \"status\" re- ports being prepared for the FAO Working Party on Small Tunas and Related Species. Fishery Biologist Howard Yoshida completed the rough draft of a report entitled \"The biology and resources of the bonitos, genus Sarda.\" Fishery Biologist Richard Uchida continued working on a manuscript"
        },
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            "spans": [
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            "content": "7"
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            ],
            "content": "describing the status of research done on the biology, systematics, distribution, and fisheries for frigate mackerels, Auxis thazard and A. rochei, on a worldwide basis."
        },
        {
            "spans": [
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            "content": "Townsend Cromwell Scouts for Hawaii's Missing Skipjack Tuna"
        },
        {
            "spans": [
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            ],
            "content": "NOAA ship Townsend Cromwell departed Honolulu on August 19 to scout for skipjack tuna around the Hawaiian Islands, carrying a load of threadfin shad to use as tuna bait. Skipjack, or \"aku,\" have been unusually scarce in the local fishery this season because the large fish that make up the biggest part of the summer catches have failed to make an appearance. In the course of the local scouting cruise, Cromwell delivered 18 buckets of shad to the commercial fishing boat Corsair in Hilo. Using the shad and three to four buckets of nehu, Corsair caught 6,000 pounds of skipjack tuna from a large school of 3 to 4-pound fish. Corsair captain Mr. Chaco Yamamoto reported that the shad worked very well as baitfish, although the biting of small skipjack tuna fished with shad was \"rough.\" Like other fishermen, Mr. Yamamoto indicated that the shad should work very well with large skip- jack tuna."
        },
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            ],
            "content": "Townsend Cromwell also transported 18 large milkfish from the historic Hawaiian fish ponds at Puako, Hawaii to Honolulu for experi- ments at the Oceanic Institute."
        },
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            "spans": [
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            ],
            "content": "During the period July 26 to August 29, Government of American Samoa employee Pulou Niuatoa recorded the lengths of. 1,212 albacore from 29 fishing vessels unloading in Pago Pago. He also collected 32 sets of catch and effort data. Utilizing data from five vessels, an average size of 90.1 cm was determined and an albacore catch per 100 hooks of 1.47."
        },
        {
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            ],
            "content": "August Report From the Hawaiian Skipjack Tuna Fishery"
        },
        {
            "spans": [
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                    "offset": 15197,
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            ],
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            ],
            "content": "The August 1975 catch of skipjack tuna in the Hawaiian fishery was an estimated 243.6 MT. This was 198.8 MT below the catch for August 1974 and 474.6 MT below the August average for 1948-74. The catch from Janu- ary through August was estimated at 1,728.5 MT, 980.0 MT below last year's batch for the same period and 1,712.0 MT below the long-term average."
        },
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            "content": "8"
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            ],
            "content": "LA JOLLA LABORATORY"
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            ],
            "content": "Coastal Fisheries Resources Division"
        },
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            "content": "ALBACORE FISHERIES"
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            "content": "Estimates of Standardized CPUE For the Entire Range Of Albacore Fishery Available For First Time In Planned Paper"
        },
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            ],
            "content": "Dr. R. Michael Laurs, Leader of the Albacore Fisheries Program, incorporated comments by reviewers and completed a draft of a manu- script on catch-per-unit effort of albacore tuna caught by U.S. jig vessels during 1961 to 1970. This paper will be published collab- oratively with albacore fishery scientists from the Pacific Coast States. Catch-per-unit effort data by time-area strata are presented for the albacore tuna fishery off the west coast of North America. The basic data used was collected by individual States and then merged and standardized. The results are unique in that they make available for the first time estimates of standardized catch-per-unit effort for the entire range of the fishery."
        },
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            ],
            "content": "Dr. Laurs also worked on a manuscript which he and Mr. Lynn plan to publish on the offshore distribution and relative abundance of alba- core tuna and the migration pattern that albacore follow into North American waters. Mr. Ron Dotson, Biological Technician, worked on a manuscript concerning estimation of minimum swimming speed of albacore tuna based on a model developed by Magnuson (1970). He revised an earlier draft of the manuscript incorporating density calculations for albacore based on measurements of freshly caught fish. Other activi- ties conducted during August by members of the Albacore Fisheries Pro- gram included work on scientific manuscripts, preparation of presenta- tions for the Pacific Science Congress, processing of oceanographic and fishery data, and issuing albacore prediction/advisory services."
        },
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            "content": "Scientists Present Invited Paper At 13th Pacific Science Congress in Vancouver, B.C."
        },
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            ],
            "content": "Dr. Laurs and Mr. R. Lynn, Oceanographer at the La Jolla Labora- tory, presented papers at the 13th Pacific Science Congress held in Vancouver, B.C. Canada, during August. Both scientists were invited to make presentations at a Symposium on climatic change in the north- eastern Pacific Ocean, jointly sponsored by the Congress and the East- ern Pacific Oceanic Conference (EPOC)."
        },
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            "content": "9"
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            ],
            "content": "Dr. Laurs presented a paper entitled \"Variations in the distri- bution and availability of albacore tuna in the eastern North Pacific and marine environmental influences.\" Geographical variations in the distribution and availability of albacore in the eastern North Pacific Ocean as indicated by shifts in the location of the fishery which takes place in waters off North America were discussed. Evidence was pre- sented linking the observed variations in the distribution and avail- ability of albacore with variations in the marine environment. Based on recent research findings, Dr. Laurs concluded 1) that the migration route which albacore follow into the waters off North America is linked to the oceanic boundary structure associated with the Transition Zone between north and central Pacific waters, and 2) that variations in the location and development of the boundaries of the Transition Zone waters in offshore waters influence the distribution and availability of alba- core in near shore waters."
        },
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            "content": "Mr. Lynn presented a paper entitled, \"On the year-to-year differences in the characteristics of the California Current.\" This paper was co- authored with Professor J. L. Reid, Director of Marine Life Research, SIO. Lynn and Reid noted that the annual variation of steric height is coherent and smooth over the CalCOFI of the California Current area. The monthly means, available in an atlas, show the tendencies for sea- sonal changes in the strength of the geostrophic flow and in the eddies and counterflows. From the steric height in any month, the mean can be subtracted to produce an anomaly which can be viewed as the difference of geostrophic flow of a particular month from the seasonal mean. When the nonseasonal variation in steric height is large, it can produce generally coherent patterns over the region. In January 1958, for example, this anomaly field has a cyclonic pattern centered about 200 to 300 km off Baja California, which indicates a stronger-than-average southward flow offshore and a stronger counterflow near shore."
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            "content": "The large coherent patterns in the geostrophic flow differences were shown to be reflected in the 10-m temperature anomaly patterns. Where there were large regions of above normal temperature there was above normal steric height. In that steric height is the integration of a quantity that increases with increased temperature this result suggests that the temperature anomalies extend to considerable depth. This was confirmed in an examination of the vertical distributions of temperature and salinity anomalies along CalCOFI line 90. In sectional plots for December 1957 the anomalies between 100 and 200 m within the southern California Bight show a simple mass redistribution that is ex- pected with the greater-than-normal flow found. However, about 100 m anomalies can only be accounted for by advection. Further investigation is needed to determine whether the examples studied are representative of the CalCOFI data record and to find whether generalizations can be made in regard to the interplay of the various anomaly fields."
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            "content": "10"
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            "content": "CalCOFI Hydrographic Data Analyzed"
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            "content": "In the analyses of hydrographic data for a presentation at the Pacific Science Congress, Ronald Lynn, Oceanographer outlined some requirements for processing a portion of the CalCOFI hydrographic data files. The requirements included monthly averages of tempera- ture and salinity at standard depths along CalCOFI station line 90, and the individual departures from these averages. Dr. Paul Smith, Leader of the Ecology of California Current Program and Lawrence Eber, Oceanographer, agreed that these requirements were a convenient and reasonable first trial in the organization and use of the CalCOFI hydrographic data files. Nancy Wiley, Computer Programmer, refor- mulated and corrected a series of CalCOFI data tapes to provide an efficient and readable data file. Eber accomplished the programming in a generalized format to accommodate future requirements for hydro- graphic data processing. Standard deviations and average dates for each monthly average was computed. A low-pass filter was applied to the monthly averages. Eber adopted the output to his EDMAP plotting/ contouring program to produce plots for 0 to 600 m and expanded plots of 0 to 150 m. The contour plot program was run for monthly averages and the anomalies for the cruise selected by Lynn. Lynn analyzed these results for inclusion in his presentation in the Pacific Science Congress."
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            "content": "Albacore-Oceanography Cruise and Data Processing Started"
        },
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            "content": "During August, processing of the data for Cromwell Cruise 65, Alba- core Oceanography Cruise was begun under the direction of Ronald Lynn. Messrs. Ken Bliss and Ron Dotson corrected thermometer readings, con- verted conductivity readings to salinities and plotted calibration curves for the STD stations. Bliss made repeated attempts to process the STD tapes but found that only 4 out of 63 stations had recorded. This necessitates that the STD analog traces be digitized by hand. Mr. T. Mulitauaopele, Fishery Biologist, worked with Mr. 0. Burris, Computer Programmer, to streamline and document the system developed at the La Jolla Laboratory to accommodate albacore catch and effort data received from the Pacific coast states to generate standardized catch-per-unit estimates for the U.S. albacore fishery. Some new com- puter programs were written and others were altered, merged, or dropped to make the system more efficient and easier to use. Catch-per-unit effort estimates for the 1973 jig fishery were generated."
        },
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            "content": "Cooperative NMFS-AFRF Albacore Field Studies Continue"
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            ],
            "content": "Since mid-July, three jigboats on charter to the American Fishermen's Research Foundation (AFRF) and in cooperation with NMFS La Jolla Laboratory"
        },
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            "content": "have been scouting and tagging albacore in the near shore waters from Guadalupe Island to the southern tip of Queen Charlotte Islands. Bio- logical technicians from the SWFC are on board two of these vessels to tag albacore, gather oceanographic and meteorological data, and collect biological samples."
        },
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            "content": "Each of the three chartered vessels is scheduled for three, 25-day cruises. All are reporting daily catch and weather information to the AFRF and subsurface temperature BATHY reports to NMFS radio station WWD. The information received is transmitted to other fishermen and interested persons by the fishing fleet and AFRF through ship-to-ship and ship-to- shore radio transmissions and by the La Jolla Laboratory through the daily Albacore Fishery Information radio broadcasts prepared by Mr. Nishimoto, Fishery Biologist. These reports are helpful in reducing search-time for albacore concentrations and planning of fishing tac- tics. Weather observations and BATHY reports are also relayed to Navy Fleet Numerical Weather Central in Monterey and the weather observations to NWS."
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            "content": "Along with the collection of fishery and oceanographic data, an estimated 450 albacore have been tagged and released by the AFRF char- ter vessels. The joint NMFS-AFRF tagging program is being conducted to study movements of albacore along the North American coast and associated oceanographic factors."
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            "content": "Japanese Fishermen Recover Large Number of Albacore Tagged During Joint NMFS-AFRF Albacore Tagging Program"
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        {
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                }
            ],
            "content": "Dr. Laurs reports that 37 recoveries were made in 1975 by Japanese albacore tuna fishermen in the western North Pacific of albacore tagged and released in the eastern North Pacific during the joint NMFS-AFRF albacore tagging program. Of these recoveries, 36 were taken on live bait fishing vessels and 1 on a longline. A total of 64 tagged alba- core which were tagged during the joint NMFS-AFRF tagging program have been recovered by Japanese and Korean fishermen, 58 caught on Japanese live bait vessels, 5 on Japanese longline vessels and 1 on a Korean long- line vessel. The results from the tag recoveries provide new information on the 1) seasonal development and distribution of the Japanese live bait fishery, 2) location and character of the migration of fish out of the live bait fishery, and 3) movements of albacore among the North American, Japanese live bait, and Japanese longline fisheries."
        },
        {
            "spans": [
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                }
            ],
            "content": "The tag returns indicate 1) that during the early portion of the Japanese live bait fishery in March-April, the fish are distributed generally over a broad latitudinal range, roughly 28° to 40º N, within a few hundred miles of the Japanese Islands; 2) as the season advances the fish move eastward in a progressively contracting latitudinal band; and 3) near the end of the live bait fishery in June, the fish appear"
        },
        {
            "spans": [
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            "content": "12"
        },
        {
            "spans": [
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            ],
            "content": "to follow a narrow, well-defined emigration route extending over only a couple degrees of latitude and centered in the Emporer Seamount area at about 35º N, 171º W. The latter conclusion is based on the recovery of 29 tagged fish within very close proximity of each other in the vi- cinity of the Emporer Seamount within a 3 week period in June 1975, and the recovery of 14 tagged fish in the same area during a 12-day period in mid-June 1974. One of the tagged fish which was captured in June 1975 near the Emporer Seamount was tagged 21 days earlier by a U.S. jig vessel conducting exploratory fishing in the western North Pacific in cooperation with the La Jolla Laboratory (see April SWFC Monthly Re- port). The fish was tagged 400+ miles WSW from where it was recovered. Assuming a straightline movement and that the fish was caught immediate- ly upon entering the location where it was recovered, the fish moved eastward at slightly over 20 miles per day."
        },
        {
            "spans": [
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                    "offset": 27314,
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            ],
            "content": "It is well-established that the North Pacific population of alba- core tuna supports three main fisheries - North American surface fish- ery, Japanese live bait surface fishery, and Japanese longline subsur- face fishery - and that there are movements of fish among these fish- eries. There is disagreement in the literature, however, concerning the pattern of movement among the fisheries. According to some inves- tigators the albacore move from the U.S. fishery mainly to the Japanese longline fishery and then to the Japanese live bait fishery, with some exchange from both of the Japanese fisheries back to the U.S. fishery. Another hypothesis is that fish upon leaving the U.S. fishery mainly enter the Japanese live bait fishery and then the Japanese longline fishery. Results from the joint NMFS-AFRF tagging program conclusively demonstrate that the latter hypothesis is correct. Ninety-two percent of the tagged albacore recovered by the Japanese have been from live bait fishing vessels and the majority of these recoveries were made during the first Japanese live bait fishing season following release of the fish."
        },
        {
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            ],
            "content": "ECOLOGY OF THE CALIFORNIA CURRENT"
        },
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            "content": "Hydroacoustics Cruise Conducted off the Los Angeles Bight Aboard NOAA Research Vessel, Jordan"
        },
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            "spans": [
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            ],
            "content": "Dr. Paul Smith, Fishery Biologist at the La Jolla Laboratory, headed a group of scientists who conducted a hydroacoustics cruise off the Los Angeles Bight aboard the NOAA research vessel, David Starr Jordan, August 5 to 15. The objectives of the cruise were to obtain direct (camera) and indirect (acoustic) measures of anchovy school compactions, obtain aerial photographs of anchovy schools, vertical high frequency acoustic measurements of volume reverberation and sound"
        },
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            "content": "13"
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            ],
            "content": "velocity profiles (STDO). The cruise also served as a training exer- cise in the use of CalCOFI bongo net tows for personnel from the In- stituto Nacional de Pesca (INP), Mexico City and the Pacific Marine Environmental Laboratory (PMEL), Seattle, Washington."
        },
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            ],
            "content": "According to Dr. Smith, anchovy schools were approached and in- sonified using the 11 kHz and 30 kHz scientific sonars on the Jordan. A skiff was directed onto the schools using the ship's sonar, radar and a skiff-mounted portable echo sounder. Free vehicle and tethered underwater camera drops were conducted from the skiff."
        },
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            ],
            "content": "Two signal processing systems were in use aboard the Jordan. A NMFS-designed system using a Digital DPD 8 computer and a Navy-designed system built around a Hewlett-Packard 2100 computer. The input signal to both systems was the echo, after amplification and filtering, re- ceived by the 30 kHz sonar transducer. Echoes from 48 arbitrarily selected schools were recorded simultaneously by both systems. The Navy system also recorded acoustic information on two schools outside the observation band sampled by the NMFS system."
        },
        {
            "spans": [
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            ],
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            ],
            "content": "Underwater camera drops were made into 34 of the 50 schools which were acoustically interrogated. Sixteen additional drops were made on schools not recorded by either system due to range-gating limitations."
        },
        {
            "spans": [
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            ],
            "content": "Aerial reconnaissance was conducted on 2 days previous to the cruise. Concentrations of anchovy schools were located 5 miles off the coast from Dana Point to Point Fermin; the aircraft operated during the cruise for 2 to 3 hours on each of 3 days. Low overcast and poor radio communications prohibited more extensive participation. Visual confirmation of the dimensions and shape of a school detected by sonar was accomplished. Three camera drops on separate schools were directed by an aerial observer."
        },
        {
            "spans": [
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            ],
            "content": "Sonar mapping of fish schools was conducted on one night between 2000 and 0400 hours using the 30 kHz sonar with 10 msec pulses. Two hundred and twenty-six targets, presumed to be fish schools, were logged during the 8-hour period. Distributions of target size and target strength were compared with data taken during daylight hours. The night schools appeared, on this occasion, to be larger in size and lower in target strength than the long-term average values for daytime schools. Observations of schools during first light (beginning of nau- tical twilight) indicate a 5 decibel (3-fold) increase in average echo intensity over a period of 20 minutes. These observations suggest the existence of large, loose schools during the dark hours which fragment and form into smaller, more compact schools as dawn approaches."
        },
        {
            "spans": [
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                }
            ],
            "content": "In addition to the work described above, neuston tows, Isaacs-Kidd midwater trawls and 4 to 15 m midwater trawls were made off the coast at Dana Point, in Santa Monica Bay, and southeast of the Santa Catalina"
        },
        {
            "spans": [
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                    "offset": 31901,
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            "content": "14"
        },
        {
            "spans": [
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                    "length": 378
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            ],
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            ],
            "content": "Islands. While the cruise was successful in locating schools of adult anchovy for study, the young-of-the-year were not as adequate- ly sampled as anticipated. Additional anchovy fry, for otolith aging, will be obtained from various bait haulers in southern California and from blanket net samples taken on the sea survey cruises of the Cali- fornia Department of Fish and Game."
        },
        {
            "spans": [
                {
                    "offset": 32283,
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            ],
            "content": "Lowest Sea Temperatures Recorded at Scripps Pier"
        },
        {
            "spans": [
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                    "offset": 32332,
                    "length": 845
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "Dick Evans, Oceanographer at the La Jolla Laboratory, reports that on August 5, 1975 the water temperature at Scripps Pier dipped to 57º F (13.9º C). This was 0.2º F below the previous low temperature recorded for August in the 68 years that water temperature records have been kept for Scripps Pier. Dr. Paul Smith of the La Jolla Laboratory was on board the R/V David Starr Jordan during this period and he undertook to docu- ment this phenomenon by conducting an XBT transect from Scripps Pier off- shore. The profile of water temperature from the XBT transect extended in a southwesterly direction for about 100 miles from Scripps Pier. Since the water temperature at Scripps Pier had warmed to 65º F (18.3º C) by August 7, the conditions that existed on August 5, were no longer in evidence on August 15 when the XBT transect was conducted."
        },
        {
            "spans": [
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                    "offset": 33178,
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            ],
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                }
            ],
            "content": "In spite of this the XBT data does indicate the reason for the cold water intrusion. The temperature profile shows that a very shallow (5 m) and sharp (4º C/5 m) thermocline existed in the nearshore region. The thermocline became deeper and weaker with increasing distance from the shore till it reached a depth of some 25 m in the offshore area. It is clear from the section that only a very small northerly component of sur- face wind would have been necessary under these circumstances to cause the upwelling of colder waters into the surface nearshore zone. This condition may have been enhanced by the mixing of deeper waters from coastal offshore canyons into the surface layer by tidal action, in consideration of the fact that large spring tides were occurring around August 5."
        },
        {
            "spans": [
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            ],
            "content": "MARINE ENVIRONMENTAL ASSESSMENT"
        },
        {
            "spans": [
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                }
            ],
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            "content": "La Jolla Laboratory Scientist Consults on Larval Fish Identification at Polish Sorting Center"
        },
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            "spans": [
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            ],
            "content": "During the last 2 weeks in August, Dr. E. Ahlstrom, Senior Scientist at the La Jolla Laboratory, visited the Ichthyoplankton Sorting Center at Szczecin, Poland, to advise and instruct the staff on identification of fish eggs and larvae. The sorting center has a staff of 25 persons, 21 of whom are working on sorting and identification of fish eggs and larvae"
        },
        {
            "spans": [
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            "content": "15"
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            ],
            "content": "and other constituents from plankton collections. About one-half of the persons on the staff are graduates of the school of fisheries, which is located in an adjacent building."
        },
        {
            "spans": [
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            ],
            "content": "Three Polish scientists attended Dr. Ahlstrom's 4-week course dealing with identification of fish eggs and larvae given at the La Jolla Laboratory in March and April of this year; two of these were from the sorting center. Hence, the purpose of the visit was to aid workers in \"problem areas\" with regard to identification of fish eggs and larvae, as well as check on how well they were identifying their material and to determine what was needed to facilitate and improve their identification of fish larvae."
        },
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            ],
            "content": "As a consequence of his evaluation of the situation at the sorting center, Dr. Ahlstrom recommended a three-pronged approach to aid work- ers in identification. Firstly, there is no comprehensive list of the fishes that could occur as eggs and larvae in their samples; inasmuch as fish larvae have to be tied to adults, their correct identification requires an informed background on juvenile and adult character. Larvae identifications are greatly dependent upon countable structures such as myomeres or vertebrae, fin ray counts, often gillraker counts, etc. - and such meristics are needed for all adults that spawn within the sur- vey area. First priority therefore, according to Dr. Ahlstrom, should be given to working up a list of the fishes that could occur and what their meristic characters are. Secondly, the workers need to know for which species the life history series are known, and for which species they are not known. Furthermore, handbooks should be compiled of the known series. Thirdly, a better reference library is badly needed. Considerable effort should be expended in getting together a basic reference library on fish eggs and larvae and on the taxonomy of adults."
        },
        {
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            ],
            "content": "Dr. Ahlstrom observed that several of the workers are making good progress in identification of fish larvae. Several of the more pro- mising workers could become \"specialists\" in particular groups of fishes - such as the gadoids, clupeoids, flatfishes, scorpaenids - and be respon- sible for checking out identifications of the other workers."
        },
        {
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            "content": "On his way to Poland, Dr. Ahlstrom visited the Museum of the Uni- versity of Copenhagen, to study material relevant to two manuscripts that are currently being completed - one dealing with scorpaenids life histories, the other with stromateoid life histories. Dr. Ahlstrom examined several collections of specimens of particular relevance to these studies; several of the collections will be sent to La Jolla for further study."
        },
        {
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            "content": "The \"Identification guide to larvae of eastern Pacific scorpion- fishes\" has now been typed and is being prepared for outside review."
        },
        {
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            ],
            "content": "Drs. E. Ahlstrom and G. Moser of the La Jolla Laboratory are collaborating with Mr. M. O'Toole of the University of Cape Town,"
        },
        {
            "spans": [
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            "content": "16"
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            ],
            "content": "South Africa, on a life history study of the commercial lanternfishes, Lampanytodes hectoris, abundant in the waters off South Africa. A manuscript is being prepared for inclusion in a special publication of the Los Angeles County Museum of Natural History honoring Dr. Carl Hubbs, Professor Emeritus of Biology at UCSD, and one of the world's most renowned ichthyologists."
        },
        {
            "spans": [
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            ],
            "content": "Ms. Elaine Carlin has almost completed her analysis of the meristics of the fishes of Magdalena Bay, Baja California, and will begin a manu- script of this study before returning to Humboldt State University this fall."
        },
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            ],
            "content": "The three authors, Dr. Ahlstrom, Mr. John Butler, and Ms. Barbara Sumida, of the manuscript dealing with \"Pelagic stromateoid fishes of the eastern Pacific, kind, distributions, and early life histories\" are busy editing the text, and striving for consistency in presentation of the information in life history series."
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            "content": "RECREATIONAL FISHERIES"
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            "content": "Anchovy Research Documents Prepared for U.S. - Mexican Meeting"
        },
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                }
            ],
            "content": "Mr. A. MacCall, CF&G Marine Biologist assigned to the La Jolla Laboratory of the SWFC, assembled a variety of documents describing the anchovy research programs in California to date. These documents were gathered in preparation for the September 26 meeting between CalCOFI and the Instituto Nacional de Pesca of Mexico. The documents include 1) a list and location of available data, with samples, 2) des- criptions of data collection, processing and display, including computer programs for fisheries statistics, and 3) a list and description of current fisheries models."
        },
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            "content": "*"
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            ],
            "content": "Mr. MacCall and Dr. G. Stauffer, SWFC Fishery Biologist, initiated the planning of the upcoming CalCOFI Symposium entitled, \"The anchovy management challenge.\" The CalCOFI Conference will be held December 9-11 on the UCSD campus in La Jolla. The Symposium will include an organized presentation of materials previously discussed in CalCOFI anchovy work- shops, and presentations by California and Mexican government represen- tatives on the policy and politics of the management of the anchovy fisheries especially with regard to expansion of Mexico's fishery. To round out the program, scientists will be invited to speak on parallel fishery experiences in South Africa and Peru."
        },
        {
            "spans": [
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            "content": "17"
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            ],
            "content": "Preliminary Stock Recruitment Model for Northern Anchovy Developed"
        },
        {
            "spans": [
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            ],
            "content": "Mr. MacCall and Dr. Stauffer this month developed a preliminary stock recruitment model for the northern anchovy population from avail- able abundance estimates based on the larva index for years 1950 to 1966. Recruitment to the spawning biomass for a given year was esti- mated from the larva index of that year minus the index of the previous year x 0.44, the average resulting change in spawning biomass after a year of growth and natural mortality. The scatter of data points is typical of stock recruitment relationships although it appears that a Ricker-type curve fits the data. The analysis indicates that recruit- ment to the spawning biomass was exceptional in 1962, 1963, and 1965. If anchovies spawn after 1 year, then one could conclude that conditions for recruitment were better than average in 1961, 1962, and 1964."
        },
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            "spans": [
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            ],
            "content": "Data on Growth and Mortality of Northern Anchovy Stocks Reviewed"
        },
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            "spans": [
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                }
            ],
            "content": "Mr. J. MacGregor, Fishery Biologist in the Recreational Fisheries Program at the La Jolla Laboratory, reviewed, and in some cases, reanalyzed data on growth and mortality of the northern anchovy stocks. The first step in applying fishery management models to the anchovy stocks is to compile, standardize, and analyze existing data. Such an inventory of available data not only provides better statistics, but also indicates what data should be collected in the future. The pri- mary purpose of the review at this time is to evaluate the application of yield-per-recruit model to the anchovy stock in light of the expanding Mexican reduction fishery. A working paper is being pre- pared for the Fourth Anchovy Workshop scheduled for January 1976 at the SWFC."
        },
        {
            "spans": [
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                    "offset": 41348,
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            ],
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                }
            ],
            "content": "Mr. MacGregor also completed the final revisions on a paper entitled \"Ovarian development and fecundity of five species of California Current fishes.\" The paper, scheduled for publication in CalCOFI Reports, Vol. 18, was returned to the editor."
        },
        {
            "spans": [
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            ],
            "content": "STOCK AND RECRUITMENT"
        },
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            "content": "Environmental Studies of the Larval Anchovy's Feeding Regime Summarized"
        },
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                }
            ],
            "content": "Early this month Dr. R. Lasker, Chief of the Coastal Fisheries Resources Division at the La Jolla Laboratory, met with scientists at the Brookhaven National Laboratory to discuss the future of the larval"
        },
        {
            "spans": [
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            "content": "18"
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            ],
            "content": "fish mortality program in the New York Bight. Plans to continue the study for a second year were agreed upon with increased participation by the Narragansett Larval Fish Laboratory of the Northeast Fisheries Center and the Sandy Hook Laboratory of the Middle Atlantic Coastal Fisheries Center. Plans have been made for Dr. E. Scura and Ms. Dorsey to join the Delaware II in November and to test summer flounder larvae in natural sea water. Similarly, a cruise aboard the R/V Eastward is planned for April 1976, in which studies on yellowtail flounder larvae will be done."
        },
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            ],
            "content": "On August 19, Dr. Lasker gave a talk in Vancouver, B.C. to the Pacific Science Congress's first session on aquatic sciences entitled \"Energy transformation in the pelagic community as related to studies on fish survival and fisheries management\" which encompassed his and Dr. Smith's latest ideas on stock and recruitment analysis from studies in the Los Angeles Bight and the California Current. In preparation for his part of this talk, Dr. Lasker prepared an Administrative Report (LJ-75-60) entitled \"Environmental studies of the feeding regime of the larval anchovy in the Los Angeles Bight\" in which he showed that the advent of storm systems and turbulent mixing of the upper 100 m during the month of March 1975 diluted the larval anchovy's food organisms to a degree where there was not enough food left to sustain first-feeding larvae in their natural environment from March through April. At the Congress, Dr. Lasker predicted that the 1975 anchovy year-class should be a relatively poor one."
        },
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            ],
            "content": "At Dr. Lasker's request, Mr. J. Brown, in preparation for the micro- stratification cruise to be undertaken in March 1976, has been developing a towed particle counter. This month Mr. Brown has built several sensor models and after testing found one that can be used with an underwater pumping system to be superior. Mr. Brown is currently investigating the use of several sensors simultaneously."
        },
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            "content": "New Findings Made on the Role of the Swim Bladder in the Ecology of Northern Anchovy Larvae"
        },
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            ],
            "content": "Dr. J. Hunter, Fishery Biologist, and Ms. C. Sanchez, Physical Science Technician at the La Jolla Laboratory, continued their work this month on the role of swim bladder development in the ecology of the northern anchovy larvae. Their past research demonstrated that the initial filling of the swim bladder occurs when larvae reach about 10 mm, thereafter, larvae inflate their bladder at night and deflate the bladder during the day. More recent work indicates that larvae often are at or near neutral buoyancy at night, whereas, those cap- tured during the day sink rapidly when not swimming. Preliminary measurements of the carbon dioxide, oxygen, and nitrogen composition of the swim bladder of anchovy larvae indicates that it does not differ from atmospheric concentrations. An experiment in which the tank was"
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            "content": "19"
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            ],
            "content": "sealed at night with mineral oil showed that the bladders of larvae in the sealed tank were less inflated than those in an unsealed tank. These data suggest that inflation of the swim bladder at night is accomplished by gulping air at the surface. This conclusion is con- sistent with other findings, e.g., no histological evidence exists for gas secretion in either larval or adult anchovy (O'Connell, pers. comm. ; O'Connell, 1955), and studies of other adult clupeoids indicates that they do not secrete gas into the swim bladder. Thus it is quite possible that larval anchovy may swim to the surface at night to fill their swim bladder. This hypothesis prompted an examination of the vertical distribution data for larval anchovy collected by Ahlstrom (1959), and from Ahlstrom's unpublished data from the same study. The vertical distribution of anchovy is summarized below for all of his collections combined. In the night collections one station (5504- 120.50) had many more larvae than the rest but if it is deleted the trends remain essentially unchanged."
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            "content": "Examination of the table suggests that the larger larvae may mi- grate vertically, swimming to the surface waters at night. The data for larger larvae captured in the day is based on only 14 larvae so this still remains speculative."
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            "content": "Vertical distribution of anchovy larvae (from Ahlstrom, 1959, and unpublished data)."
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            "content": "Percent"
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            "content": "Depth m"
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            "content": "Larvae Day"
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            "content": "< 11.75 mm Night"
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            "content": "Larvae Day"
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            "content": "≥ 11.75 mm Night"
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            "content": "2"
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            "content": "26.6"
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            "content": "42.7"
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            "content": "28.3"
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            ],
            "content": "A paper by Dr. Ann Hurley, former NOAA Fellow at the La Jolla Lab- oratory, entitled \"Feeding behavior, food consumption, growth and res- piration of squid (Loligo opalescens) raised in the laboratory\" has been accepted for publication in the Fishery Bulletin, U.S."
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            "content": "The squid Loligo opalescens was raised by Dr. Hurley in the labora- tory to a maximum age of 100 days on a diet of Artemia nauplii and adults. She found that newly hatched squid (2.7 mm mantle length) readily attack- ed Artemia nauplii (length 0.7 mm), Artemia adults (length 5 mm), copepods (length 1 mm) and larval fish (length 4 mm). Feeding rates varied between 35 and 80% of squid body weight per day. Growth rate was highly variable in different individuals, ranging from 0.5 to nearly 4.5 mm mantle length per month. Respiration rates were obtained at 15º C for squid of three different ages and at 10°, 15°, and 20º C for 1 day old squid."
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            "content": "Visiting Scientist Completes Manuscript on Comparison of"
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            "content": "Food and Feeding in Three California Current Fishes"
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            "content": "Dr. David K. Arthur, visiting scientist at the SWFC, has recently completed a manuscript reporting on the intestinal contents of larvae of Pacific sardine, northern anchovy and jack mackerel taken in CalCOFI samples. The taxa and size of food, diurnality of feeding and the feed- ing incidence of the larvae of these three important California Current fishes were compared."
        },
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            "content": "A curious decline in feeding incidence is common to the early larval stages of several species of the genus Engraulis is noted. This decline coincides with a lack of increase in the expected size of food particles ingested and also may be related to differences in relative body depth, i.e., the physical condition of laboratory-grown when compared with ocean-grown anchovy larvae."
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            "content": "Daily Rings in Anchovy Otoliths Investigated"
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            "content": "Mr. Kramer, Fishery Biologist at the La Jolla Laboratory, has been learning and developing techniques for removing, mounting, and reading otoliths for daily growth rings from the larvae of anchovy, Pacific mackerel and jack mackerel reared in the Southwest Fisheries Center aquarium to compare with those from anchovy larvae and other fishes (larvae, juveniles, and adults) collected in the field."
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            "content": "Mr. Kramer discovered this month, that in addition to the sagittae, another pair of otoliths in most fishes, the asterisci, can also be read for daily rings, thus providing a check on the counts made with the sagittae. In many instances, when sagittae grow too thick for direct reading by transmitted light, the asterisci, which grow at a much slow- er rate, can still be read without resorting to grinding or etching pro- cedures."
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            "content": "Juvenile anchovy could not be collected by Mr. Kramer for daily growth ring studies on the recent Jordan survey, August 5 to 15. How- ever, arrangements have been made to obtain the desired sized fish from the bait and young fish surveys conducted by California Department of Fish and Game."
        },
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            "content": "*"
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            ],
            "content": "Dr. William Vlymen, NOAA Research Associate at the La Jolla Labora- tory, is attempting to model the anchovy larva's behavior and environ- ment using data obtained in the laboratory and at sea. Dr. Vlymen has derived a closed form expression for the recurrence times of the attack event from a Markov chain attack model. The attack rates found by the model were identical to those observed by Dr. John Hunter for 4 to 5 mm larvae feeding on high concentrations of food particles."
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            "content": "An estimation of the representative particle size distribution in the Los Angeles Bight during the peak anchovy spawning season was made from the recent Niskin bottle-Coulter Counter surveys of Dr. Richard Eppley of the Scripps Institution of Oceanography. Analysis of the data showed a remarkable fit by a hyperbolic size distribution. This type of particle size distribution has been found to be particularly ubiquitous in nature."
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            "content": "This distribution also allows calculation of a density function for particle sizes and a concomitant mean particle size for any size range. These averages are important in the model because anchovy lar- vae feed on only a certain range of the prey distribution at any time in their life. The exact range as a function of size was determined from data and literature supplied by Dr. David Arthur, visiting scien- tist at the Southwest Fisheries Center."
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            "content": "In addition to the above work, a caloric value size relation was worked out and a theoretical estimation of the larval size distribution at 2.0 cm was constructed."
        },
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            "content": "Distribution of Food Organisms for Larval Fish to be Studied on Cruise in the Los Angeles Bight"
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            ],
            "content": "As part of the Southwest Fisheries Center investigation of factors affecting recruitment of anchovies, Dr. E. Scura, Physiologist at the La Jolla laboratory, spent the past month preparing for a September cruise in the Los Angeles Bight. One of the objectives of the cruise is to study the distribution of food organisms for larval fish. Pre- vious cruises have located areas in the Los Angeles Bight where suffi- cient food of the proper size (30 to 50 m) is available for first feed- ing anchovy larvae. However, laboratory studies indicate that older larvae require larger food organisms in concentrations greater than 1/ml. The purpose of the September cruise is to develop methods for locating aggregations of larger food organisms."
        },
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            ],
            "content": "A Model \"A\" Coulter Counter has been modified so that it can be used in a search for aggregations of particles at sea. Some of the modifications are: 1) the standard counting chamber has been replaced with a continuous flow chamber with a 1-mm aperture. This chamber is capable of measuring particles in the 40 to 400 m size range; 2) the volume measuring switch has been replaced with an on-off switch so that the instrument can be made to count continuous rather than for a discrete volume; and 3) the electronic unit has been modified to de- tect counting rate rather than absolute counts. The instrument output was connected to a chart recorder so that small increases in counting rate appear as peaks on the recorder. The peak height is proportional to the concentration of particles in the water passing through the counting chamber."
        },
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            "content": "The plan is to pump water through a small diameter hose which will be connected to a hydro-wire as it passes through the water column. A portion of the sample stream will be diverted through the counting cham- ber. If a patch is detected by the Coulter Counter, a sample will be taken from the hose for further investigation."
        },
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            "content": "The surface layer is also an area where food organisms might po- tentially aggregate. To sample just the top few centimeters at the sur- face, a small volume continuous-flow surface skimmer has been developed to be used in conjunction with the Coulter Counter and will also be tested on the September cruise."
        },
        {
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            "content": "23"
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            "content": "Oceanic Fisheries Resources Division"
        },
        {
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            "content": "PORPOISE/TUNA"
        },
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            "spans": [
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            ],
            "content": "NMFS Report on Progress of Research on Porpoise Mortality Incidental to Tuna Purse Seine Fishing for Fiscal Year 1975 Released to Public"
        },
        {
            "spans": [
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            ],
            "content": "A comprehensive report (SWFC Administrative Report No. LJ-75-68), \"Progress of research on porpoise mortality incidental to tuna purse seine fishing for fiscal year 1975\", compiled by Dr. William Fox, Acting Chief of the Oceanic Fisheries Resources Division, and the staff of the Porpoise/Tuna Interaction program, headed by Dr. William Lenarz, was released to the public by NMFS, Washington, D.C. on August 18, 1975. This report will serve as background information on hearings in early October 1975, on consideration of the issuance of a general permit allowing the tuna industry a continued incidental take of marine mam- mals."
        },
        {
            "spans": [
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            ],
            "content": "An expanded program of porpoise research was started in late 1972 at the La Jolla Laboratory as a direct result of the passage of the Marine Mammal Protection Act of 1972. The objective of the program was to develop fishing methods and gear technology which would reduce the incidental mortality of porpoises in the yellowfin tuna purse seine fishery and to determine the status of the porpoise stocks associated with the incidental mortality. As presently constituted the program to accomplish this consists of three somewhat related components: 1) mortality reduction technology, 2) general biology, ecology, and popu- lation dynamics, and 3) data management and quantitative analysis."
        },
        {
            "spans": [
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            ],
            "content": "The following is a summary of information contained in this progress report."
        },
        {
            "spans": [
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            ],
            "content": "During the year, two gear research cruises were conducted to test a variety of gear and methods under charter to the NMFS. In addition, the large volume purse seine net, apron, anti-torque cable, lengthened current ribbons, and porpoise grabber received additional testing in the U.S. purse seine fleet with the cooperation, participation, and investment of members of the fleet. The resulting evaluation of the"
        },
        {
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            ],
            "content": "data from these cruises and the field technician program indicates that technological developments certain to reduce further incidental porpoise mortality are the use of speedboats, when needed, to hold the net open prior to the execution of backing down and the use of rescuers at the corkline. Technological developments that will re- quire further testing and analysis but that are promising to reduce further incidental porpoise mortality are certain design features of the large volume purse seine, finer mesh Medina panels and use of fine mesh in other areas of the nets, the porpoise apron, and the grabber."
        },
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            "spans": [
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            ],
            "content": "A major paper on the general biology of the offshore spotted dol- phin (Stenella attenuata), historically the species with the highest mortality in the eastern Pacific tropical tuna fishery was completed. The study was based on data from several thousand specimens of these porpoises and treated such matters as gestation period, fetal growth, age determination, length-weight relationships, geographical variation, etc. Biological research has since concentrated on the biology of the eastern spinner dolphin (Stenella longirostris subspecies), the species with the second highest total incidental mortality. Work on the bi- ology of the common dolphin (Delphinus species), the species with the third highest mortality, and the striped dolphin (Stenella coeruleoalba), a more rarely encountered species, is continuing. One of the more diffi- cult problems in porpoise biology, direct calibration of age, received special attention when a contract was granted to Dr. Jeffrey Bada of the University of California at San Diego, to apply his new technique to aging mammals through biochemical analysis of dental protein."
        },
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            "spans": [
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            ],
            "content": "Under the provisions of the Marine Mammal Act of 1972, and with the cooperation of the U.S. tuna fleet, NMFS field technicians go to sea aboard U.S. tuna purse seiners, where they count porpoises killed incidentally in the fishing operations, record statistics on size and makeup of the catch, collect specimens to be used in studies of por- poise life histories and stock assessments, and make detailed observa- tions of the rescue operations during each tuna set, and make other observations on cetaceans and birds. In 1975, the field technician program, working cooperatively with the tuna industry completed 31 trips, which adequately covered the entire U.S. unregulated, yellow- fin tuna fishing season within the CYRA."
        },
        {
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            "content": "Information derived from the field technician program is integrated with data from an aerial survey and further treated statistically to derive an estimation of porpoise stocks. Tentative conclusions of the staff are that the stock of offshore spotted dolphins in the eastern Pacific is estimated at 3.1 to 3.5 million animals. Using data obtain- ed from the field technician program and data collected by the Inter- American Tropical Tuna Commission, the staff estimated that 72,000 offshore spotted dolphins were killed in 1974. The estimated inci- dental fishing mortality rate for 1974 is 2.1 to 2.3%. The best"
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                }
            ],
            "content": "estimate at present is that biologically, the population could sustain an annual fishing mortality rate of 1.4 to 4.4%. There is no striking evidence that the stock is either increasing or decreasing."
        },
        {
            "spans": [
                {
                    "offset": 59472,
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            ],
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            ],
            "content": "Similar estimates place the stock of eastern spinner dolphins in the eastern Pacific at 1.1 to 1.2 million animals and the 1974 annual rate of mortality caused by fishing at 1.8 to 1.9%. The best estimate at present is that, biologically, the population could sustain an annual incidental fishing mortality of 2.8%. As with the spotted dolphin, there is no striking evidence that the stock is either increasing or decreasing."
        },
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                }
            ],
            "content": "Using data from 1973, 1974, and 1975, an evaluation of the U.S. tuna fleet's kill rate performance for 1975, under conditions compar- able to previous years, was made. Tentative conclusions which were made from the analysis of these data indicated that total porpoise mortality from fishing in 1975 will probably be greater than 1974. The revised preliminary kill estimate for 1974 was 113,000 animals (98,000 by U.S. vessels). The preliminary kill estimate for 1975 is 93,000 to 214,000 animals. Using the same percentage as in 1974, the U.S. kill for 1975 will probably be 81,000 to 186,000 animals. While it appears that the kill rate will be higher in 1975 than in 1974, analysis of the data revealed that fishing conditions changed between 1974 and 1975 and that under similar conditions the kill rate in 1975 would have been 22% lower than in 1974."
        },
        {
            "spans": [
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            "content": "NASA Cooperation Permits Evaluation of Aircraft for Porpoise Surveys"
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        {
            "spans": [
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            "boundingRegions": [
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            ],
            "content": "On August 13, 1975, the Bering Sea Marine Mammal Experiment (BESMEX) and the Arctic Ice Dynamics Experiment (AIDEX) flew their remote sensing systems checkout mission aboard NASA's Galileo II. At the request of the National Marine Fisheries Service, Mr. James Coe, Fishery Biologist at the La Jolla Laboratory, was permitted to observe this mission in order to form opinions on the feasibility of employing Galileo II for porpoise survey work and to aid in the loca- tion and filming of a school of porpoise."
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                }
            ],
            "content": "Dr. G. Carlton Ray, Principal Investigator, BESMEX was very interested in the problems of small cetacean survey and kindly agreed to a major alteration of his mission's flight plan in the event that a good target could be located. Before the flight, Mr. Coe was briefed on the mission and acquainted with problems encountered in remote sensing of animal populations in general."
        },
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                }
            ],
            "content": "The BESMEX segment of the mission was to consist of four east/ west passes over the Santa Barbara Channel Islands from Anacapa Island to San Miguel Island at an altitude of 3,000 feet and an air speed of 250 knots. On each of these legs, the camera systems, RC-8, KS-87, and the IR scanner would be operated over general targets (pinnipeds, kelp"
        },
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            "content": "26"
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                }
            ],
            "content": "beds, land masses, hauled-out pinnipeds, birds, and whales) and if pos- sible, a large school of porpoise. If conditions permitted and a por- poise school was found, it was agreed that the school would be recorded from 3,000, 5,000, 10,000, and possibly 15,000 feet."
        },
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            "spans": [
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            ],
            "content": "Unfortunately, low stratus clouds from 1,500 to 2,500 feet pre- cluded flying the intended tracks. Instead the aircraft was led through some small openings in the cloud cover and parts of San Miguel and Santa Rosa Islands and the surrounding waters were scanned using the KS-87 camera and the IR imager. The RC-8- x 9-inch film format camera system was inoperable below 3,000 feet due to target motion. A school of about 1,000 to 2,000 Delphinus sp. were sighted about 5 miles south of San Miguel Island and four passes were made over the school from an altitude of about 1,500 feet using the motion compensated KS-87 camera and the IR imager."
        },
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            ],
            "content": "Mr. Coe was subsequently informed that cursory examination of the segments of the film exposed over the porpoise school revealed nothing. This may have been because the porpoises submerged as the aircraft ap- proached or they may simply have been missed. The IR scanner tapes also showed nothing from the porpoise school either, but this may have been due to the magnitude of temperature differential which the scanner was set to detect (20° C) and that IR sensing may be a useful tool in small cetacean survey work. In summary, Mr. Coe is of the opinion that the Convair 990, specifically the Galileo II, is not suitable for visual survey work. He recommended, however, that NOAA/NMFS should now define its survey/sensing needs. Since BESMEX and NASA are cooperative and interested, it may be possible to examine NASA's extensive capabilities in this area for porpoise surveys in the future."
        },
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            ],
            "content": "TUNA RESOURCES"
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            ],
            "content": "Preparations Continue for ICCAT Meeting"
        },
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            ],
            "content": "Each year the Standing Committee on Research and Statistics (SCRS) of the International Commission for the Conservation of Atlantic Tunas ( ICCAT) meet to evaluate the status of the Atlantic tuna stocks and to advise the Commission on scientific matters relating to the conservation of the stocks. This year the SCRS will meet during November 12-18 in Madrid, Spain. Current Chairman of the SCRS is Dr. Brian Rothschild, Director of the Southwest Fisheries Center."
        },
        {
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            ],
            "content": "The staff of the Tuna Stock Assessment task at the La Jolla Labora- tory, headed by Acting Leader, Dr. Gary Sakagawa, is planning to submit documents at the meeting. Members of the task continue to work on anal- yses that will be used in about 10 documents. During the past month, progress was made in the preparation of documents on size composition"
        },
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            "spans": [
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                    "offset": 64733,
                    "length": 2
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            ],
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            ],
            "content": "27"
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        {
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                }
            ],
            "content": "of tropical tunas caught by the U.S. fleet, status of the skipjack tuna stocks, status of the bigeye tuna stocks, and size composition of yellowfin and skipjack tunas caught by all fleets in the Atlantic. Documents on the status of the yellowfin tuna stocks are scheduled for completion and submission to the SCRS."
        },
        {
            "spans": [
                {
                    "offset": 65051,
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            ],
            "content": "First Working Versions of Computer Data Base for Atlantic Tunas Completed"
        },
        {
            "spans": [
                {
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            "boundingRegions": [
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            ],
            "content": "The first working versions of catch and length-frequency computer data bases for Atlantic tunas were completed by Mathematician A. Coan and Fishery Biologists G. Sakagawa and T. Murphy at the La Jolla Labora- tory. The catch data base contains all catches of Atlantic tunas, by country, for 1960-73. The length-frequency data base contains length frequencies of skipjack, yellowfin, and bigeye tunas by gear, month, and ocean region where catches were made. Current plans are to expand and update the data bases, and use the bases as integral components in future studies on tuna stock assessment."
        },
        {
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            ],
            "content": "Tuna Vessels Participate in FAX Program"
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            ],
            "content": "During August a total of 29 U.S. seiners participated in the FAX program of the La Jolla Laboratory. Reporting rates for August 1975 were down from August of 1974 by about 23% as shown below."
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            "content": "August Reporting Rates"
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            "content": "Weather observations"
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            "content": "XBT observations"
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            "content": "Total"
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            "content": "1974"
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            "content": "310"
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            "content": "87"
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            "content": "Percent"
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            "content": "Change"
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            "content": "-56.3%"
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            "content": "-22.9%"
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            "content": "January-July"
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            "content": "1974"
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            "content": "Change"
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            ],
            "content": "Much of the drop in reporting rate for August can be explained by the fact that more than 40 U.S. seiners returned to San Diego to protest foreign fishing inside the Commission Yellowfin Regulatory Area (CYRA). Most of these seiners are cooperating vessels that collect expendable bathythermograph and weather observations. The tuna seiner, Jeanette C, again led cooperating vessels in August with 45 weather observations sent by radio to the Southwest Fisheries Center."
        },
        {
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            "content": "Relationship Between Fishing Success and Environmental Parameters Investigated"
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            "content": "Industrial Economist D. Huppert, Oceanographer R. Evans, and Mathematical Technician K. Brennecke at the La Jolla Laboratory are investigating the relationship between fishing success and environ- mental parameters in the eastern tropical Pacific tuna fishery. Pre- liminary analysis with data for the first 3 months of the 1973 fishing season indicated that catch-per-set, mean set size, and successful set probability are significantly correlated with such environmental para- meters as wind speed, cloud cover, wave height, swell height, sea sur- face temperature, and depths of the 60° and 74º F isotherms. Further analyses with a longer series of data are in progress."
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            "content": "TIBURON LABORATORY"
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            "content": "COASTAL FISH COMMUNITIES INVESTIGATIONS"
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            "content": "Assessments of Food Available to Nearshore Fishes in Representative Habitats Completed"
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            "content": "At the Tiburon Laboratory, Dr. Edmund Hobson, Project Leader, and Fishery Biologist Tony Chess, completed the program of quarterly assess- ments of foods available to fishes in representative habitats at Catalina Island, California. This month they completed the last, and most complex, of the six representative habitats under study -- the kelp (Macrocystis) forest. Assessments are based on direct counts along established tran- sect lines, and sampling with dredge and air lift. As in other habitats, resident fishes are among the organisms sampled. Study of the gut con- tents of these fishes demonstrates which of the organisms present are in fact consumed as food."
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            "content": "29"
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            "content": "COASTAL FISHERIES INVESTIGATIONS"
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            "content": "Pen Rearing of Silver Salmon Starts New Cycle"
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            ],
            "content": "Through the aid of the Northwest Fisheries Center, Seattle, Wash- ington, 51,000 silver salmon smolts were received at the Tiburon Labora- tory as scheduled on August 1. The fish averaged about 19 gm and were in excellent condition upon arrival despite the long journey from Olympia, Washington."
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            "content": "The Salmon Rearing and Release Subtask is a cooperative program involving the Tiburon Laboratory, Sea Grant, California Department of Fish and Game, and the Tyee Club, a sportfishermen's organization. The objective is to rear salmon in salt water pens for release into San Francisco Bay to supplement the recreational fishery catch."
        },
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            "content": "Fifty-one thousand silver salmon juveniles being transferred into the floating net pen at the Tiburon Laboratory. Mortality of fish was very low."
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            "content": "Eleven thousand salmon were transferred to Tomales Bay where Sea Grant and several sportfishing groups are undertaking a similar project. The remainder of the fish are presently in two floating pens at the Tiburon Laboratory. After an initial mortality of 2,550 fish in the first 5 days, the mortality rate is now about 42 fish per day. After being fed on moist food which contained antibiotic for 12 days the salmon are now feeding on dry pelletized feed."
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            "content": "A fish pump was successfully used to transfer fish from one pen to another. During the transfer a videotape system was used to monitor the number of fish being moved. Although results were not spectacular, the system holds some promise of being useful for counting fish."
        },
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            "content": "Anglers' Guide Approved by Center Director"
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            "content": "The Anglers' Guide was approved by the Director SWFC this month, after it was returned from reviewer Dan Miller of the CF&G and his suggestions incorporated. Happily, there were few changes. After these have been corrected by the typist, authors Jim Squire, Fishery Biologist at La Jolla, and Susan Smith, Publications Specialist at Tiburon, plan to submit the manuscript to NMFS Scientific Editor, Dr. Bruce Collette, around the first of September."
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            "content": "The Guide described marine game fish, fishing grounds, and angler facilities all along the U.S. West Coast (California, Oregon, Washington, and Alaska), and around the tropical islands of Hawaii, American Samoa, and Guam."
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            "content": "PHYSIOLOGY INVESTIGATIONS"
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            "content": "Staff Gears Up for Striped Bass Program; Work Continues on Manuscripts"
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            "content": "At the Tiburon Laboratory, Dr. Jeannette W. Struhsaker, Chief, Physiology Investigations, and her staff continued to work on the completion of manuscripts resulting from studies on the effects of mono-aromatic hydrocarbons on fish. Most manuscripts are now in the process of being reviewed. Time was also spent gathering information for the new striped bass program."
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            "content": "The staff of the Physiology Investigations toured a portion of the Sacramento-San Joaquin Delta and visited the fish diversion facility at Tracy. The tour was provided by the California Department of Fish and"
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            "content": "Game. The purpose of the trip was to familiarize the staff with the environment in the striped bass spawning and nursery areas in the Delta in preparation for their upcoming laboratory studies on sources of mor- tality in striped bass early life stages. Samples of zooplankton and phytoplankton were also taken in preparation for culture in the labora- tory as food for striped bass larvae."
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            "content": "A meeting has been planned for September 12 at the Tiburon Labora- tory to discuss striped bass research and to familiarize the physiology staff with work done on this species by other agencies. Members of the California Department of Fish and Game, Bureau of Reclamation, California Department of Water Resources, and the Fish and Wildlife Service have been invited to attend."
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            "content": "Maxwell Eldridge, Fishery Biologist, continued working on the three manuscripts resulting from studies of the effects of aromatic hydrocar- bons on embryos and larvae of Pacific herring. Pete Benville, Research Chemist, spent part of this month modifying his striped bass/bay shrimp toxicity paper in accordance with one reviewer's comments, and also re- arranging the chemistry laboratory."
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            "content": "PUBLIC RELATIONS - SOUTHWEST FISHERIES CENTER"
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            "content": "August 6 Instructor Carol Eyster and 20 students from Dana Junior High School, San Pedro, California, visited the Center for a lecture on research being conducted at the Center and a tour of Center facilities. Ms. L. Vlymen, Special Assistant, was the lecturer and tour guide."
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            ],
            "content": "29 The following news release was issued by the SWFC - Elbert Ahlstrom named Scientist-of-the-Year by San Diego Society of Natural History."
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            "content": "SEMINARS"
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            "content": "Honolulu Laboratory"
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                }
            ],
            "content": "August 6 Mr. Eugene Kridler, U.S. Fish and Wildlife Service, Endanger- ed Species Coordinator for the Hawaiian Islands, spoke on \"Endangered animal species of the Pacific\" at a seminar given at the Honolulu Laboratory."
        },
        {
            "spans": [
                {
                    "offset": 73076,
                    "length": 275
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            ],
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                }
            ],
            "content": "13 Commander Merritt N. Walter, formerly commander of the NOAA wire drag ships Rude and Heck and presently commanding offi- cer of the NOAA ship Townsend Cromwell, presented an informal seminar to the Honolulu Laboratory staff on \"Dragging for wrecks with the Rude and Heck.\""
        },
        {
            "spans": [
                {
                    "offset": 73352,
                    "length": 2
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            ],
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            "content": "32"
        },
        {
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                    "offset": 73355,
                    "length": 19
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            ],
            "content": "La Jolla Laboratory"
        },
        {
            "spans": [
                {
                    "offset": 73375,
                    "length": 251
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            ],
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                }
            ],
            "content": "August 14 Dr. Reuben Lasker, Leader of the Coastal Fisheries Resources Division at the La Jolla Laboratory, presented a talk enti- tled, \"Was the spawning season a disaster for the northern anchovy?\" to begin the fall seminar series at the laboratory."
        },
        {
            "spans": [
                {
                    "offset": 73627,
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            ],
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            ],
            "content": "Tiburon Laboratory"
        },
        {
            "spans": [
                {
                    "offset": 73646,
                    "length": 96
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            ],
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                }
            ],
            "content": "August 8 Dr. Victor Loosanoff of the Pacific Marine Station spoke on 'Biology and Common Sense.\""
        },
        {
            "spans": [
                {
                    "offset": 73743,
                    "length": 118
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            ],
            "content": "29 Dr. Louis DiSalvo of the Navy Biomedical Laboratory presented results of some of his work on hydrocarbon pollution."
        },
        {
            "spans": [
                {
                    "offset": 73862,
                    "length": 19
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            ],
            "content": "MEETINGS AND TRAVEL"
        },
        {
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                {
                    "offset": 73882,
                    "length": 317
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            ],
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            ],
            "content": "August 4 Honolulu Laboratory Director Richard Shomura departed Honolulu to attend the Southwest Fisheries Center Management Meeting, August 5-6, in La Jolla. While on the mainland he visited the Tiburon Laboratory, where he discussed the progress of the baitfish transport project with Project Leader Mr. Roger Green."
        },
        {
            "spans": [
                {
                    "offset": 74200,
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            ],
            "content": "5 The Southwest Fisheries Center Executive Committee, consist- ing of the Director, SWFC, Deputy Director, Honolulu and Tiburon Laboratory Directors, and Division Chiefs, La Jolla Laboratory met at the Summer House Inn in La Jolla to discuss, among other matters, adjustment to the base budget for the Center."
        },
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            ],
            "content": "6 Mr. Maxwell Eldridge of the Tiburon Laboratory sampled the water quality in Richardson Bay as part of a bi-monthly sampling cruise conducted in cooperation with the California Regional Water Quality Control Board."
        },
        {
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                {
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            ],
            "content": "11 State/Federal Technical Committee meeting, Long Beach, CA. Attended by Dr. Rothschild, Planning Officer David Mackett, and Tiburon Laboratory Director Norm Abramson."
        },
        {
            "spans": [
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                    "offset": 74895,
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                }
            ],
            "content": "12-13 Mr. Susumu Kato travelled to Moss Landing Laboratory to attend a Squid Advisory/Technical Panel meeting. The panel was formed by Sea Grant to review its research activity on squid."
        },
        {
            "spans": [
                {
                    "offset": 75082,
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            ],
            "content": "13 Mr. Shomura attended a meeting of the Natural Area Reserves Commission of the State of Hawaii held in the conference room of the Honolulu Laboratory."
        },
        {
            "spans": [
                {
                    "offset": 75235,
                    "length": 2
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            "content": "33"
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            ],
            "content": "17-19 Dr. William H. Lenarz, Acting Head of the Porpoise/Tuna program at the La Jolla Laboratory, attended a meeting of the American Institute of Biological Sciences held at Oregon State University, Corvallis, Oregon, where he co-chaired a symposium entitled, \"Comparison of biologi- cal predation and fisheries exploitation.\""
        },
        {
            "spans": [
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            ],
            "content": "18 Dr. George Kanahele met with Messrs. Shomura and Robert Iversen to discuss Hawaii's 1978 Marine Exposition. Dr. Kanahele is Executive Director of the Hawaii Bicentennial Marine Commission, set up to commemorate the 200th anni- versary of the discovery of the Hawaiian Islands by Captain James Cook."
        },
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            ],
            "content": "18-19 The Physiology Investigations staff at Tiburon accompanied the California Department of Fish and Game's survey boat on a trip to the Sacramento-San Joaquin Delta area to deter- min natural spawning and nursery areas of striped bass."
        },
        {
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            ],
            "content": "19-22 The La Jolla contingent to the 13th Pacific Science Congress in Vancouver, B.C. consisted of Drs. B. Rothschild, M. Laurs, R. Lasker, and Mr. R. Lynn. Dr. Rothschild presented a paper at the Congress entitled, \"The institutional and organizational framework of contemporary fishery regimes.\" The papers pre- sented by Laurs, Lasker and Lynn are described under the sub- mission for the Coastal Fisheries Resources Division earlier in this report."
        },
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            ],
            "content": "21 Mr. Shomura and Drs. Richard Barkley, Andrew Dizon, Robert Skillman, and Jerry Wetherall discussed skipjack tuna re- sources of the Pacific with Dr. Robert Kearney of the South Pacific Commission."
        },
        {
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            ],
            "content": "25-27 Dr. William Fox, Chief, Oceanic Fisheries Resources Division, travelled to Washington, D.C. to review draft propoise en- vironmental impact statement."
        },
        {
            "spans": [
                {
                    "offset": 76916,
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            ],
            "content": "26 Drs. Lenarz and Perrin and Mr. R. McNeely of the NMFS North- west Fisheries Center, Seattle, Washington, attended a plan- ning meeting for a cooperative NMFS-tuna industry porpoise program with representatives of LMR, Inc., in San Diego."
        },
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            ],
            "content": "27 Fishery Biologist James L. Squire of the La Jolla Laboratory was at the Tiburon Laboratory to review the Anglers' Guide, in preparation at the laboratory."
        },
        {
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                {
                    "offset": 77315,
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            ],
            "content": "28 Dr. Barkley presented a talk to the Kiwanis Club of Windward Oahu describing the activities of the Honolulu Laboratory."
        },
        {
            "spans": [
                {
                    "offset": 77438,
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            "content": "34"
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            ],
            "content": "August 29 Messrs. Norm Abramson, Susumu Kato, and Roger Green attended a salmon meeting at the Tiburon Laboratory to discuss the proposed salmon program to start in February. The meeting was also attended by represen- tatives of California Department of Fish and Game, Sea Grant at U.C. Davis, and the San Francisco Tyee Club."
        },
        {
            "spans": [
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            ],
            "content": "VISITORS"
        },
        {
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                    "offset": 77777,
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            "content": "Honolulu Laboratory"
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            ],
            "content": "August 12 Dr. Richard Wass, Office of Marine Resources, American Samoa."
        },
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                {
                    "offset": 77869,
                    "length": 2
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            ],
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            "content": "13"
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                }
            ],
            "content": "Mr. Benjamin Remington, Executive Officer, SWFC, La Jolla. Dr. Makoto Suzuki, Tokyo University of Fisheries, Tokyo."
        },
        {
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                {
                    "offset": 77988,
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            ],
            "content": "18 Ms. J. Anita Coit, Administrative Assistant, SWFC, La Jolla."
        },
        {
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                {
                    "offset": 78052,
                    "length": 71
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            ],
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            ],
            "content": "19 Dr. Robert Kearney, South Pacific Commission, Noumea, New Caledonia."
        },
        {
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                {
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            ],
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            ],
            "content": "21 Mr. Palmer Sekora, U.S. Fish and Wildlife Service, Honolulu. Ms. Carol Takara, Librarian, Environmental Protection Agency, Honolulu."
        },
        {
            "spans": [
                {
                    "offset": 78260,
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            ],
            "content": "25 Mr. Arthur Woodland, South China Sea Programme, Manila."
        },
        {
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                {
                    "offset": 78319,
                    "length": 107
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            ],
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            ],
            "content": "29 Mr. Nick Trutanic, Star-Kist Foods, Inc., California. Mr. Philip M. Roedel, Fisheries Advisor, U.S. AID."
        },
        {
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                {
                    "offset": 78427,
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            "content": "La Jolla Laboratory"
        },
        {
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            ],
            "content": "August 1 Mr. Vladimir Gurevich, Sea World, Inc., San Diego."
        },
        {
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                {
                    "offset": 78507,
                    "length": 65
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            ],
            "content": "7 Mr. Makoto Suzuki, Tokyo University of Fisheries, Tokyo, Japan."
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            ],
            "content": "4-8 Dr. William Aron, Director, Office of Ecology and Environ- mental Conservation, Mr. Herb Blatt, NOAA Staff Attorney, and Mr. Pete Jensen, Staff Specialist, Marine Mammal and Endangered Species Divison, Washington, D.C. to confer on Porpoise Progress report for FY 1975."
        },
        {
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                    "offset": 78847,
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            "content": "35"
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            "content": "11-15 Mr. Carmen Blondin, Mr. Fred Olson, Barbara Keith, NMFS Office of International Fisheries attended the Tuna Policy Committee Meeting."
        },
        {
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                {
                    "offset": 78990,
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            "content": "31 Joanne Webber, Secretary (Typing), Promotion La Jolla"
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            "content": "31 Kate Coleman, Secretary (Typing), Promotion La Jolla"
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            "content": "TRAINING"
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