{"Bibliographic":{
"Title":"Southwest Fisheries Center Monthly Report: June 1975",
"Authors":"",
"Publication date":"1975",
"Publisher":"Southwest Fisheries Center (U.S.)"
},
"Administrative":{
"Date created":"06-26-2025",
"Language":"English",
"Rights":"CC 0",
"Size":"0008162272"
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    "content": "MY\nIENT OF CO\nIM\nPA\nERCE\nDE\n*\nUNITED\nAMERICA\nSTATES OF\nHONOLULU\nLA JOLLA\nTIBURON\nRECEIVED\nAUG 4 1975\nSOUTHWEST FISHERIES CENTER\nMONTHLY REPORT - JUNE 1975\nRESEARCH HIGHLIGHTS\nPage\nPublications\n1\nNMFS Scientists on NOAA research vessel, Cromwell, Investigate Offshore Distribution of Albacore Tuna in Relation to Oceano-\ngraphic Features 3\nVessel Continues to Catch Red Crabs 5\nSilver Salmon Tagging Mortality Study Initiated 6\nPhysiological Parameters Used to Describe Habitat Distribution of Tunas\n7\nProgress Report on NMFS Porpoise Research in Preparation 10\nStudy of Physiological Effects of Crude Oil Components in Life Stages of Fishes Being Terminated .\n11\nTwo-a-Day Weather Advisories to be Continued by SWFC and National Weather Service, Redwood City . 12\nOcean Environment Related to Fishing Success in Eastern Tropical Pacific Tuna Fishery 13\nU.S. - Mexico Plan Collaborative Research on Anchovies 14\nJoint Aerial and Acoustic Anchovy Surveys Planned 18\nDaily Ring Measurements in Larval and Juvenile Anchovies Can be Used to Determine Rate of Birth 19\nTechniques Under Development to Study Structure of Food Patches for Larval Anchovy in the Sea 19\nGuide to Scorpionfish Larvae in Final Stage 21\nThreadfin Shad Tested as Live Bait in Hawaii's Skipjack Tuna Fishery 24\nNOAA/NMFS\nTIBURON MARINE LABORATORY\nENT\nOF C\n1M\nDEPA\nERCE\nUNITED\nED STATES OF AMERI\nHONOLULU\nS\nLA JOLLA\nTIBURON\nSOUTHWEST FISHERIES CENTER\nMONTHLY REPORT - JUNE 1975\nRESEARCH HIGHLIGHTS\nPage\nPublications\n1\nNMFS Scientists on NOAA research vessel, Cromwell, Investigate Offshore Distribution of Albacore Tuna in Relation to Oceano- graphic Features 3\nVessel Continues to Catch Red Crabs 5\nSilver Salmon Tagging Mortality Study Initiated 6\nPhysiological Parameters Used to Describe Habitat Distribution of Tunas\nProgress Report on NMFS Porpoise Research in Preparation 10\n7\nStudy of Physiological Effects of Crude Oil Components in Life Stages of Fishes Being Terminated . 11\nTwo-a-Day Weather Advisories to be Continued by SWFC and National Weather Service, Redwood City . 12\nOcean Environment Related to Fishing Success in Eastern Tropical Pacific Tuna Fishery . 13\nU. S. - Mexico Plan Collaborative Research on Anchovies 14\nJoint Aerial and Acoustic Anchovy Surveys Planned 18\nDaily Ring Measurements in Larval and Juvenile Anchovies Can be Used to Determine Rate of Birth 19\nTechniques Under Development to Study Structure of Food Patches for Larval Anchovy in the Sea 19\nGuide to Scorpionfish Larvae in Final Stage 21\nThreadfin Shad Tested as Live Bait in Hawaii's Skipjack Tuna Fishery . 24\nNOAA/NMFS\nENT OF CO\nMA\nDEPA\nERCE\n*\nIT\nED STATES OF\nAMERICA\nHONOLULU\nLA JOLLA\nTIBURON\nSOUTHWEST FISHERIES CENTER\nMONTHLY\nREPORT - JUNE 1975\nRESEARCH HIGHLIGHTS\nPage\nPublications\n1\nNMFS Scientists on NOAA research vessel, Cromwell, Investigate Offshore Distribution of Albacore Tuna in Relation to Oceano- graphic Features 3\nVessel Continues to Catch Red Crabs 5\nSilver Salmon Tagging Mortality Study Initiated 6\nPhysiological Parameters Used to Describe Habitat Distribution of Tunas\nProgress Report on NMFS Porpoise Research in Preparation 10\n7\nStudy of Physiological Effects of Crude Oil Components in Life Stages of Fishes Being Terminated . 11\nTwo-a-Day Weather Advisories to be Continued by SWFC and National Weather Service, Redwood City 12\nOcean Environment Related to Fishing Success in Eastern Tropical Pacific Tuna Fishery . 13\nU. S. - Mexico Plan Collaborative Research on Anchovies 14\nJoint Aerial and Acoustic Anchovy Surveys Planned 18\nDaily Ring Measurements in Larval and Juvenile Anchovies Can be Used to Determine Rate of Birth 19\nTechniques Under Development to Study Structure of Food Patches for Larval Anchovy in the Sea 19\nGuide to Scorpionfish Larvae in Final Stage 21\nThreadfin Shad Tested as Live Bait in Hawaii's Skipjack Tuna Fishery .\n24\nNOAA/NMFS\nENT OF COMM\nDEPAR\nMERCE\n*\nUNITED\nED STATES OF\nAMERICA\nHONOLULU\nLA JOLLA\nTIBURON\nSOUTHWEST FISHERIES CENTER\nMONTHLY REPORT - JUNE 1975\nRESEARCH HIGHLIGHTS\nPage\nPublications\n1\nNMFS Scientists on NOAA research vessel, Cromwell, Investigate Offshore Distribution of Albacore Tuna in Relation to Oceano- graphic Features 3\nVessel Continues to Catch Red Crabs 5\nSilver Salmon Tagging Mortality Study Initiated 6\nPhysiological Parameters Used to Describe Habitat Distribution of Tunas\nProgress Report on NMFS Porpoise Research in Preparation 10\n7\nStudy of Physiological Effects of Crude Oil Components in Life Stages of Fishes Being Terminated . . . 11\nTwo-a-Day Weather Advisories to be Continued by SWFC and National Weather Service, Redwood City . 12\nOcean Environment Related to Fishing Success in Eastern Tropical Pacific Tuna Fishery . 13\nU. S. - Mexico Plan Collaborative Research on Anchovies 14\nJoint Aerial and Acoustic Anchovy Surveys Planned 18\nDaily Ring Measurements in Larval and Juvenile Anchovies Can be Used to Determine Rate of Birth 19\nTechniques Under Development to Study Structure of Food Patches for Larval Anchovy in the Sea 19\nGuide to Scorpionfish Larvae in Final Stage . 21\nThreadfin Shad Tested as Live Bait in Hawaii's Skipjack Tuna Fishery\n. 24\nNOAA/NMFS\nS\nSOUTHWEST FISHERIES CENTER LA JOLLA, CALIFORNIA\nHONOLULU LABORATORY LA JOLLA LABORATORY TIBURON LABORATORY\nMONTHLY REPORT - JUNE 1975\nSTATUS OF PUBLICATIONS\nPublished\nStruhsaker, Jeannette W., Wayne J. Baldwin and Garth I. Murphy. 1975. Environmental factors affecting stress and mortality of the Hawaiian anchovy in captivity. University of Hawaii, UNIHI-SEA GRANT-TR-75-02.\nNehu (Stolephorus purpureus) is the primary baitfish in the Hawaiian skipjack tuna fishery. The purpose of this study was to increase fishing efficiency by reducing baitfish mortality and time spent baiting.\nThe following biological and technicological factors were examined for their effect on nehu mortality: salinity, aeration, oxygen, temperature, current, light, tank color, recirculated reduced salinity, buffers, protein skimmer, density, food, disease, and predation. Time of bait capture (night or day) was also examined. A study of these factors and their effect on survival was made during capture and transfer to bait wells, in experimental laboratory tanks, in bait wells on an experimental barge, and in baitwells of commercial vessels while at sea. Results of these studies were applied in designing and testing improved live bait holding facilities.\nThe experiments demonstrated that reduced handling of nehu following capture plus modifications to the live bait wells will significantly reduce nehu mortalities and improve the efficiency of the fishery.\nApproved by Center Director\n\"Ovarian development and fecundity of five species of California Current fishes\" by John S. MacGregor. For publication in California Cooperative Oceanic Fisheries Investigations Reports.\n\"The development and use of sonar mapping for pelagic stock assessment in the California Current area\" by Roger P. Hewitt, Paul E. Smith and John C. Brown. For publication in the Fishery Bulletin, U.S.\n\"Pre- and post-hatch growth of fishes - A general model\" by James R. Zweifel and Reuben Lasker. For publication in the Fishery Bulletin, U.S.\n\"Growth and reproduction of the spotted porpoise, Stenella attenuata, in the offshore eastern tropical Pacific\" by William F. Perrin, James M. Coe, and James R. Zweifel. For publication in the Fishery Bulletin, U.S.\n\"A uniform U.S. west coast logbook for albacore tuna, Thunnus alalunga (Bonneterre) and coastwide albacore fishery data system\" by R. Michael Laurs, Charles Hooker, Larry Hreha and Richard Lincoln. For publication in Marine Fisheries Review.\n\"Sonar mapping in the California Current area: A review of recent developments\" by Roger Hewitt. For publication in California Cooperative Oceanic Fisheries Investigations Reports.\n\"Growth of laboratory-reared northern anchovy (Engraulis mordax) from southern California\" by Gary T. Sakagawa and Makoto Kimura. For publication in the Fishery Bulletin, U.S.\n\"Exploratory shrimp trawling in the Hawaiian Islands\" by Paul Struhsaker and Howard 0. Yoshida. For publication in the U.S. National Marine Fisheries Service, Marine Fisheries Review.\n2\nALBACORE FISHERIES INVESTIGATIONS\nNMFS Scientists on NOAA Research Vessel, Cromwell Investigate Offshore Distribution of Albacore Tuna in Relation to Oceanographic Features\nThe recently reactivated NOAA research vessel, Townsend Cromwell, departed Seattle, Washington on June 19 on a survey to examine the offshore distribution of albacore tuna in relation to oceanographic features during the period of onshore migration. (The objective and background of this cruise were reported in the SWFC Monthly Report for April.) Mr. Ron Lynn, Oceanographer at the La Jolla Laboratory, was the head of the scientific party on the Cromwell.\nSalinity-temperature-depth (STD) hydrographic stations to 1,000 m were taken along most of the cruise track between the Straits of Juan de Fuca and Honolulu. A transect between 40° and 30º N along 137°30' W, which had been taken in the three previous years was repeated. Along this transect the subtropic front was found at 32º10' N -- a similar position to previous years. However, the subarctic front was near 39º30' N, 100 miles further north than in 1972 and 1973. The average depth of the 33.8º/o. isohaline which falls in the halocline of the subarctic was 150 m compared to 200 m for the earlier years; thus the front did not extend as deep this year.\nIn 1974 the subarctic front was diffuse and a remnant was found at 36°30' N. Although it is not warranted to make a definitive conclusion based on a single annual transect of these ocean features, it appears that the Transition Zone is half again as broad as in 1972 and 1973, and the northern boundary of the subarctic front not as strongly develop- ed. A situation somewhat similar to last year prevailed again this year. These conclusions are preliminary.\nJig \"trolling\" using 10 lines was started when the Cromwell first en- countered sea surface temperatures in excess of 58ºF at 42°15' N, 134°07' W; the first albacore were taken within an hour. Trolling was conducted along the entire 137°30' W transect (between 40° and 30º N). The ship lay-to during hours of darkness. In all, 113 albacore were caught, 93 north of 35º N and 20 to the south. The largest number caught in one day was 48 at 38°30' N, 137°30' W. Fork lengths were measured on all fish and muscle samples, intestines and heads were collected for research projects underway involving analysis of tissue, trace metals, and otoliths. Nine neuston tows were taken.\n3\nRadio contact was maintained with the three fishing vessels on charter to the American Fishermen's Research Foundation (AFRF) (a fourth vessel cancelled out of the joint research because of mechanical difficulties) when possible, and daily fishing reports were sent in by radio to the La Jolla Laboratory and AFRF through radio station WHG.\nSixty-three STD stations were taken before mechanical problems with the vessel forced cancellation of the remaining eight stations; XBT casts were taken in place of the STD casts.\nAmerican Fishermen's Research Foundation Charter Vessels Complete Offshore Albacore Survey\nAs part of the NMFS-AFRF cooperative albacore research studies, three jigboats and one baitboat on charter to AFRF departed San Diego on June 1 and June 5, respectively, to conduct exploratory albacore fishing and to tag albacore in the early-season offshore fishery. The first albacore was caught by these boats on June 2 about 125 miles west-southwest of San Diego; however, no particular concentra- tions of fish were found. On June 7 the baitboat caught 50 fish (36 on jigs and 14 on bait) west of Guadalupe. One of the jigboats developed mechanical problems and headed for San Diego on June 12.\nAlthough the boats took some fish on most days their catches did not exceed 17 fish per day (except for the one day mentioned), until they reached 38º N in the offshore area during the last week of June. At that point their scores occasionally exceeded 100 fish per day. On june 29 the boats separated, one worked toward Astoria, Oregon and the others worked toward San Diego, each arriving in port near the beginning of the second week in July.\nThe albacore were found scattered over a very broad region; some had moved close to southern California at an early date and a modest number were found much further north than in previous surveys. The ocean characteristics that likely influenced this distribution were the warmer-than-average temperatures in the offshore region, the broad spread of Transition Zone waters and the modest development of the subarctic front. The concentrating effect of the Transition Zone and the boundary fronts upon the albacore was more effective in 1972 and 1973 when the Zone was more narrow and the fronts were stronger.\n4\nCOASTAL FISH COMMUNITIES INVESTIGATIONS\nAnalysis of Feeding Habits of Fishes Foraging over Sand Bottoms Continues\nThis month the investigators studying nearshore fish communities at the Tiburon Laboratory, Dr. Edmund Hobson, Project Leader, and Fishery Biologist, Tony Chess, continued analyzing the feeding relationships of fishes that forage over the open sand bottom adjacent to the kelp forests.\nThe work has involved assessing the organisms living in the sand that are prey of fishes, as sampled with a coring device. These organisms include polychaetes, mollusks, ostracods, cumaceans, amphipods, and mysids, all of which are being identified to species were feasible. Close attention has been paid to the movements many of these organisms make into the water column at night, as sampled with a plankton net.\nThe feeding habits of the fishes that forage on and above the sand, most of them important recreational species, are being related to these prey occurrences and movements. Fishes under study that live on the sand day and night include the California halibut, Paralichthys californicus, the C-O Turbot, Pleuronichthys coenosus, and the speckled sand dab, Citharichthys stigmaeus. Fishes under study that forage over the sand at night after passing the day sheltered in the forest include the shiner surfperch Cymatogaster aggregata and the walleye . surfperch, Hyperprosopon argenteum.\nCOASTAL FISHERIES INVESTIGATIONS\nVessel Continues to Catch Red Crabs\nThe commercial fishing vessel Lady Olga returned to port in San Pedro with 76,000 1bs of pelagic red crabs, caught in international waters off Baja, California. Fishery Biologist Susumu Kato of the Tiburon Laboratory reports that this was the vessel's best trip; it took only eight fishing days to catch, as well as grind and bag the crabs.\n5\nThe vessel left again in mid-June for its last trip prior to the albacore season. As before, the catch was sold to salmon growers in the Northwest. The Tiburon Laboratory was instrumental in getting this fishery started. Researchers at the Northwest Fish- eries Center and Pacific Fishery Products Technology Laboratory developed the primary market in the new and fast-growing salmon pen rearing industry. The Southwest Regional Office has also played a vital role in logistics.\nSilver Salmon Tagging Mortality Study Initiated\nThe Salmon Rearing and Release Task is a cooperative program involv- ing the Tiburon Laboratory, Sea Grant, California Department of Fish and Game, the Tyee Club, a sportfishermen's organization. The objec- tive is to rear salmon in salt water pens for release into San Francisco Bay to supplement the recreational fishery catch. Task Leader Susumu Kato, and Biological Technician Lloyd Richards of the Tiburon Laboratory, report that a tagging study was initiated this month to compare rates of shedding and early tag-related mortality between fish tagged with Carlin and anchor tags. The efficacy of two levels of antibiotics was incorporated into the study to earn effects of treatment on survival rate. Robert Rawstron of the California Department of Fish and Game aided by demonstrating efficient tagging procedures. Seventeen days after tagging, six fish (8%) have died including two controls and two each of Carlin and anchor tagged fish.\nFeeding studies are being conducted in an effort to induce silver salmon to feed on cheaper dry pellets. The fish are presently on a ration of 60% moist pellets mixed with 40% dry pellets, with no appreciable decline in feed uptake. The percentage of dry food will gradually be increased, hopefully to 100%.\nVolunteer student Stanley Smith has isolated and cultured a disease organism tentatively identified as Vibrio. Further studies will be done to obtain positive identification of the bacteria. Vibriosis is the disease which is of greatest concern to most salmon growers.\nWork continues on preparing the Pacific Anglers' Guide for publication. The Guide, co-authored by Jim Squire, Fishery Biologist at La Jolla, and Susan Smith, Publications Specialist at Tiburon, describes marine game fish fishing grounds and angler facilities all along the U.S. West Coast from California to Alaska, and around the tropical islands of Hawaii, American Samoa and Guam.\n6\nDuring the month, Ms. Smith travelled to Rockville, Maryland, to meet with cartographer Jim Goodlin, (NOAA Visual Services), who is preparing the Guide's 40 coastal fishing charts. They discussed various ways of presenting the fishing information on the base maps, and made final decisions on the layout of each fishing chart. An effort is being made to make the charts not only readable, well organized and attractive but also relatively inexpensive to print -- hopefully passing on the savings to the public when the book be- comes available through GPO. The authors plan to have the Guide ready for the printers in late fall.\nFISH ENVIRONMENTAL INVESTIGATIONS\nPhysiological Parameters Are Used to Describe Habitat Distribution of Tunas\nUsing three physiological parameters, Oceanographer Dr. Richard Barkley has succeeded in explaining many of the features of the geographical distribution of skipjack tuna and some aspects of their vertical distribution. Parameters used include the ultimate lower lethal temperature, an upper lethal temperature of 35º C obtained by adding the temperature of the water to the excess body temperature, and oxygen levels at or slightly below 5 ppm. All three values were empirically determined with captive tuna at Honolulu Laboratory's Kewalo Basin Facility.\nSince this approach proved so fruitful with skipjack tuna, and for comparative purposes, the Experimental Ecology of Tunas group under Dr. Andrew Dizon, Fishery Biologist at the Honolulu Laboratory, is expanding its observations using yellowfin tuna while modifying procedures to conserve supplies of hard-to-obtain yellowfin tuna. Fish are tested for 2 days in the behavioral thermoregulation tank with low oxygen levels and/or gradients and then used to determine excess body temperatures and coefficients of heating and cooling for different tissues.\nMessrs. Randolph Chang and Minato Yasui, the latter a graduate student from Takai University, have tested five yellowfin tuna. Data have been analyzed to determine excess temperatures and k coefficients for four. Results indicate that for both parameters, yellowfin do not differ significantly from skipjack tuna.\n7\n1\nPrior to testing for k's and excess temperatures, fish behavior is examined under stable low oxygen conditions and slowly decreasing oxygen levels starting at saturation. Skipjack tuna are also tested in order to have a measure with which to compare the behavior of the yellowfin tuna. Fourteen skipjack tuna and four yellowfin tuna have been tested. Although the supply of yellowfin tuna is too small to do a credible low oxygen resistance study, one can get an idea of the relative abilities of yellowfin tuna to withstand oxygen stress when their performance is compared with skipjack tuna and speckled trout. Consider the following observations and numbers: Yellowfin tuna demonstrated no change in behavior during periods of decreasing (to 1.55 ppm) and then increasing oxygen levels lasting approximately 300 min; skipjack tuna in contrast dramatically increase swim speed as oxygen drops 4 ppm and never survive the recovery. Showing no visible signs of stress or alterations from basal swim speeds, tested yellowfin tuna survived 200 min at 1.4 ppm and 200 min at 1.6 ppm. These two fish were 46.7 and 50.6 cm, respectively, and swam remark- ably precise laps at 1.5 lengths/sec. Skipjack tuna cannot survive these levels very long. Death occurred in 42 min at 1.7 ppm; 20 min at 1.4 ppm; and 47 min at 2.6 ppm. Swimming speeds of skipjack tuna increase up to about 3.5 lengths/sec at oxygen levels below 4 ppm. Literature values for speckled trout LDFare 100 min at 1.4 ppm when forced to swim at 1.5 lengths/sec. It seems from these preliminary data that yellowfin tuna has ability to withstand low oxygen stress that is comparable to other nonscombrid fish. If supplies of yellow- fin become more plentiful, Dr. Dizon will measure routine respiration rates and do a proper resistance study.\nFEI Chief Dr. Richard Barkley completed a manuscript entitled \"Hypo- thetical habitat of skipjack tuna based on temperature and oxygen requirements.\" Internal review has been completed and the draft is being revised.\nInstrument Designed to Facilitate Heat Transfer; May Lessen Tuna \"Burn\"\nHonolulu Laboratory Fishery Biologist Heeny Yuen is chief investiga- tor into a phenomenon described as fish \"burn\", a discoloration of the flesh occurring in yellowfin and bigeye tunas taken by trolling and handline off the island of Hawaii.\n8\nHypothesizing that the condition is caused by heat denaturation of body protein as a fish struggles on the hook, Mr. Yuen has designed a \"heat transfer facilitator.\" It is hoped that this simple instrument, now ready for \"ease-of-handling\" tests, may expedite the transfer of the fish's body heat away from the tissues.\n* * *\n1\nResearch Assistant Randolph Chang at the Honolulu Laboratory is preparing a paper on the effects of low oxygen as a barrier to voluntary movements of tunas for presentation at the coming Tuna Conference at Lake Arrowhead.\nMARINE MAMMALS\nNOAA General Counsel Reviews Application of Freedom of Information Act to NMFS Porpoise Data\nMr. John Milholland, General Counsel, NOAA, visited the South- west Fisheries Center, June 9 to 12, to carry out legal research on the application of the Freedom of Information Act to various kinds of porpoise data and records. He consulted with scientists and observers of the tuna-porpoise program, studied a cross- section of data files, and met on the morning of June 12 with Messrs. August Felando of the American Tunaboat Association, and Frank Alverson, Living Marine Resources, Inc., as well as Center personnel for the purpose of gaining a better understanding of the commercial significance of certain kinds of data. He also had an opportunity to discuss the problem with Mr. Harold Medina, a tunaboat captain, and other industry representatives at an industry meeting with NMFS Director Robert Schoning on June 10 in San Diego.\nMr. Raymond Hubley, Chief, Endangered Species and Marine Mammal Coordinator, was at the Center on June 9 and met with Center personnel and Southwest Region Director, Gerald V. Howard, in a detailed examination of factors to be considered in making a transition from a research-mode porpoise observer program to one which will collect management information as well.\n9\nProgress Report on NMFS Porpoise Research in Preparation\nPrincipal effort of biologists, marine mammalogists, and popu- lation dynamics specialists involved in the Porpoise/Tuna program at the La Jolla Laboratory, under the leadership of Dr. William Lenarz, has been devoted for the past 2 months to the preparation of a progress report on the results of NMFS porpoise research for the 1975 Fiscal Year. The report will include estimates of porpoise mortality, life histories of the principal porpoise species involved in the tropical tuna fishery in the eastern Pacific, population estimates of spotted and spinner dolphins, and an evaluation of data compiled by the porpoise observers who accompanied U.S. tuna seiners. The report is scheduled to be completed in August and the National Marine Fisheries Service in Washington, D.C. plans to release it to the public later that month.\nRecent Developments in Porpoise/Tuna Research\nAs of June 30, only three NMFS observers remained at sea. Thus far during the 1975 tuna fishing season, 28 trips have been completed by NMFS porpoise observers on tuna vessels of the U.S. fleet.\nAnother tuna seiner is due to leave port during July with a NMFS gear research technician aboard. The ship will carry a porpoise apron, current indicator ribbons, and prototypes of the \"porpoise grabber\" (a device to help guide porpoise out of the net). Final arrangements are also being completed to place the NMFS large- volume purse seine, current indicator ribbons, and porpoise grabber aboard another seiner, which will also carry a NMFS gear research technician to observe functioning of these porpoise-saving devices.\nOn June 17, Dr. Eric Barham, Mr. David Holts of the La Jolla Laboratory, and Mr. Jerry Jurkovich of the Northwest Fisheries Center, participated in a required training workshop for tunaboat skippers, administered by the NMFS Southwest Region through the American Tunaboat Association. Mr. Jurkovich discussed the opera- tion of the porpoise apron, Dr. Barham talked about some preliminary results achieved by various tuna boats who have tried the device at sea under actual fishing conditions, and Mr. Holts discussed aspects of the biology of porpoises.\n10\nOne of the research efforts of the Porpoise Stock Assessment Task is to review the dynamics of other exploited mammals, particularly cetaceans, to develop insights on the dynamics of porpoise stocks. As an outgrowth of this work, Fishery Biologist Tim Smith at the La Jolla Laboratory has completed a short manu- script on changes in population size of sei whales, in support of the U.S. efforts at the International Whaling Commission held in London during June 1975, entitled \"Calculation of apparent increases in the Antarctic sei whale population between 1930 and 1960.\" Dr. Smith concluded in this manuscript that if, as is suggested, the Antarctic sei whale population was increasing prior to initial exploitation in the early 1960's, then the con- cept of single species maximum sustainable yield is not necessarily immediately applicable to determining optimum harvesting levels. In particular, there is no meaningful equilibrium population size as a known reference point. The other species of baleen whales in the Antarctic might have to be considered before any sort of equilibrium can be defined, but the population dynamics tools needed for multi-species exploitation need to be developed.\nPHYSIOLOGY INVESTIGATIONS\nStudy of Physiological Effects of Crude Oil Components on Life Stages of Fishes being Terminated\nDr. Jeannette Struhsaker, Chief, Physiology Investigations and her staff have been working to complete manuscripts on the physio- logical effects of mono-aromatics in crude oil on fish. This program will terminate at the end of FY-75, June 30.\nSid Korn, Fishery Biologist, sent tissue samples from Pacific herring to be analyzed for phenol content. Phenol is probably the major metabolite produced from benzene metabolism in fish.\nDr. Struhsaker announced that initial planning is in progress for the study of striped bass egg embryo and larval stages; work will begin in FY-76 on mortality factors during these stages.\nPete Benville, Chemist, initiated monitoring studies required by the Environmental Protection Agency (EPA) for sewer discharge for the sea water system discharge. Influent and effluent discharges from both the sea water system and sewer plant have been analyzed for the components specified by new EPA standards.\n11\nSTOCK ASSESSMENT AND FISHERY EVALUATION INVESTIGATIONS\nTwo-a-Day Weather Advisories to be Continued by SWFC, La Jolla and NWS, Redwood City\nIn the May Monthly Report it was announced that SWFC would broad- cast, on a trial basis, a \"Wind and Weather Analysis and Advisory Chart\" in the morning at 1400 GMT (0700 PDT). After the trial period, (June 9 to 13), the favorable responses received from tuna fishermen indicated that the early morning chart was a useful service. It will, therefore, be continued indefinitely. The major advantage of the new chart is that it incorporates more recent information concerning the formation and movement of storms in the tropical Pacific. This is particularly valuable information during the \"chubasco\" season.\nThe skipjack tuna stock of the Atlantic ocean has long been con- sidered an underexploited resource, but fisheries for this species are developing rapidly. Fishery Biologist T. Murphy at the La Jolla Laboratory is compiling data for a paper that will review the history of the skipjack fisheries and attempt to evaluate the status of the present Atlantic stock. This work is part of the La Jolla Labora- tory's effort in preparation for the 1975 ICCAT meeting to be held in November in Madrid, Spain.\nTuna Vessel Participation in Radio Weather Reporting Program Remains High\nThe number of weather and XBT observations received by radio station wwd, La Jolla, continues to exceed the reporting rate of last year. During June a total of 34 U.S. purse seiners reported observations.\n12\nJune Reporting Rate\nWeather Observations\nXBT Observations\nTotal\n1974\n152\n36\n188\n1975\n222\n63\n285\nPercent\n+75%\n+52%\nchange\n+46%\nJanuary - June\nWeather Observations\nXBT Observations\nTotal\n1974\n1306\n204\n1510\n1975\n1611\n350\n1961\nPercent\nchange\n+23%\n+71%\n+30%\nOcean Environment Related to Fishing Success in Eastern Tropical Pacific Tuna Fishery\nDuring the past year, scientists from NMFS, La Jolla Laboratory, and the Inter-American Tropical Tuna Commission, completed the first phase of a joint project to study possible relationships between success in purse seining for tropical tunas and the ocean properties monitored aboard tuna boats. A detailed statis- tical analysis has now been completed by Mr. Forrest Miller, IATTC, Mr. Dick Evans, Mr. K. Bliss, La Jolla Laboratory and Mr. C. Orange, IATTC, using approximately 2,000 surface and sub- surface (expendable bathythermograph) observations matched in time and location to purse seine sets. The environmental data included sea surface temperature (SST), mixed layer depth (MLD), temperature gradient in the thermocline (TGRAD), and windspeed (WSPD). These parameters were paired with catch data which included the catch-per- set, the type of set (porpoise set, school set, log set, night set), the species of tuna captured, and the type of set attempted when no fish were captured. For each vessel all the variables were averaged over 5° squares per month. After eliminating \"skunk sets\" the 127 data points remained for use in the statistical analyses.\n13\nThe statistical results re-confirmed earlier studies which note the importance of the thermocline depth (MLD) and temperature gradient in explaining catch success. Surface temperature (SST) alone did not provide a satisfactory explanation of catch per set. However, an examination of the data revealed that 86% of the successful sets on yellowfin were made in waters where SSTs were between 79º and 83.5º F. From season-to-season the area of the eastern tropical Pacific bounded by the 79º and 84º F isotherms fluctuates markedly. The annual distribution of yellowfin catch confirms that the areas most heavily fished correspond to the surface temperature regime between 79° and 84º F.\nSome of the more revealing statistical results were multiple regression equations which used average catch-per-set as the dependent variable and SST, TGRAD, WSPD and MLD as independent variables. Initial analysis indicated that MLD might have a non- linear effect. Dummy variables were fitted to the equation until it was determined that the MLD had a critical value of 100 feet. Using this critical value on porpoise sets, the environmental para- meters combined to explain 22% of the variation in the catch.\nAnalogous results for the non-porpoise set were insignificant, probably due to the small number of observations. Although the proportion of variance explained by the linear regression equation was small, the highly significant F-statistics lend support to the hypothesis that environmental conditions which were monitored are important factors in the success of tuna seining. A more compre- hensive study of these relationships is underway based on the insights gained in this initial analysis.\nSTOCK RECRUITMENT INVESTIGATIONS\nU.S. - Mexico Plan Future Collaborative Research on Anchovies\nDr. Reuben Lasker, Acting Chief of the Coastal Fisheries Division at the La Jolla Laboratory, represented NMFS at a joint meeting of the Instituto Nacional de Pesca-California Cooperative Oceanic Fisheries Investigations scientists at Cocoyoc, Mexico, June 26 and 27, to discuss areas of mutual interest and possible collabora- tion in the study of anchovies in the California Current area. As\n14\na starting point, the establishment of the following three working groups was approved: a) status of the anchovy stocks, b) acoustic surveys, and c) egg and larval surveys.\nThe participants agreed that the \"status of the stocks\" workshop will take place sometime in September and both sides are being asked to prepare documents such as a list and location of avail- able data; a full description of data collection, processing and display as well as a list of computer programs available for fishery statistics and a list and description of existing models on stock and recruitment, bio-economic and yield-per-recruit.\nDr. Lasker proposed an agenda for the acoustics workshop that was agreed to, in principle, by all parties. The meeting day of the acoustics workshop will be on December 4 or 5, prior to the annual CalCOFI meeting in San Diego. The egg and larval survey working group will meet on December 16 and 17.\nOther types of collaborations discussed at this meeting included FAO Fellowships at the Southwest Fisheries Center and scientific consultation by La Jolla Laboratory scientists in Mexico.\nExperiments Begun to Evaluate Starvation as Cause of Mortality in Jack Mackerel Larvae\nExperiments were begun this month by Ms. Gail Theilacker, Fishery Biologist at the La Jolla Laboratory, to evaluate starvation as a cause of mortality in jack mackerel larvae. Jack mackerel eggs were collected aboard the David Starr Jordan, 200 miles off San Diego this month. The eggs were returned to the aquarium at the La Jolla Laboratory and the larvae reared at three temperatures, 14º C (range 14.0° to 14.2º C), 16° C (range 14.0° to 17.0° C), and 17º C (range 16.5° to 17.2º C), using a high density feeding regime. At 16° C a low density experiment was also included. The food organisms were Gymnodinium splendens (a dinoflagellate fed at 200/ml in all feeding trials), Brachionus plicatilis (a rotifer offered at 50 and 0.1/ml) and Tisbe furcata (a copepod fed at 4 and 0.002/ml). One group at each temperature was de- prived of food. Larvae were sampled daily for 2 weeks from each test group and preserved for histological studies.\nAt 14° and 16° C the larvae started feeding on day 7 (hatching = day 1) and the yolk and oil were absorbed by the 12th to 13th day at 14° C and by the 9th and 10th day at 16° C. Feeding commenced on day 6 at 17º C and the yolk and oil were absorbed by the 8th to 9th day.\n15\nIt was interesting that many larvae in the groups that were fed appeared to be starving. This was especially noted on the days of yolk and oil absorption. These larvae exhibited very slow swimming movements and/or the body cavity seemed to be bloated. These specimens were also preserved.\nLarvae survived for 3 weeks in the low density feeding experiment at 16° C and at 4 weeks a few are still alive in the high density group.\nEfforts Made to Replenish Spawning Stocks of Mackerel at La Jolla Laboratory\nMr. R. Leong, Fishery Biologist, reports that efforts are being made to capture new Pacific mackerel to replenish dwindling spawning stocks at the La Jolla Laboratory. These fish are usually found in the La Jolla kelp beds during the summer months and can be caught with hook and line. The fish being caught measure about 10 inches in total length and are too small to spawn, but should be mature by the spring of the coming year. Enough mature fish remain to fulfill any forseeable egg demands. A manuscript is being prepared to describe the maturation of mackerel under different light-temperature conditions in the laboratory.\nThe end result of the report is the formulation of a scheme to have ripe fish in the laboratory throughout the year and spawn them on demand with gonadotropic agents. In nature, the Pacific mackerel spawns off the southern California coast only during May through August. It appears the temperature is far more important than the photoperiod in regulating maturation and a high temperature, 19º C or more, will accelerate egg development. However, prolonged ex- posure to high temperatures also has a debilitating effect and the state of health of the fish begins to decline in about 4 months with eventual death in about 6 months. The fish develop more slowly at 16° to 17º C but the mackerel remain healthier and a few are ripe the year around. The ripe fish can be detected through a biopsy technique and can then be spawned with a combination of hormone injections. The combination now being used is 1 mg of crude salmon pituitary followed 24 hours later with 100 units of pregnant mare serum.\n16\nApparatus Designed for Predation Experiments on Eggs and Larval of Northern Anchovy\nMs. Carol Sanchez, Biological Technician at the La Jolla Laboratory, spent a portion of last month in designing and con- structing an apparatus designed to evaluate various biological and physical variables involved in the predation by fish on eggs and larvae of the northern anchovy. Under construction are three, 10-foot diameter tanks which are manifolded together, each with 6-foot-long fiberglass troughs. This apparatus, when completed, will permit maintaining a stock tank of predators in one tank, stocks of larvae in another tank, and the movement of predators and larvae from their maintenance tank to a third tank by move- ment through the troughs and gates. The third tank will serve as a test tank where behavior and ingestion rates of the predators will be studied. Initial objectives of this work will be to determine, whether or not various fish predators, including anchovy, jack mackerel and Pacific mackerel, are capable of feeding on eggs and larvae of anchovys in significant quantities and the mode of feeding behavior used by the predator. Studies will also focus on the role of larval size, or stage of development and physical condition, (starved vs. unstarved larvae) and on the vulnerability to predator. Also, certain measurements will be taken to facilitate future field work such as determining the time a larva or egg can remain in the gut of a predator and still be identified, and in- direct methods for determining the length of ingested specimens.\nThis month, Dr. Edward Scura, Physiologist at the La Jolla Laboratory, continued to investigate the causes of larval fish mortality in the Los Angeles Bight. Data collected on the CalCOFI cruises indicates that good feeding conditions prevailed for first-feeding anchovy larvae along the southern California coast this past winter. The predominant phytoplankton in the chlorophyll maximum was the dino- flagellate, Gonyaulax polyedra. This organism is the proper size for first-feeding anchovy (ca 50 um) but preliminary laboratory experiments indicate that larval growth and survival is reduced when G. polyedra is the only food available. Currently, larval anchovies are being reared on a diet of G. polyedra supplemented with various concentrations of copepod nauplii (Tisbe furcata) in an attempt to simulate conditions as they might exist in the environment.\n17\nComputer Runs of 25,000 CalCOFI Time Series of Sized Anchovy and Sardine Larvae Completed\nComputer runs of 25,000 CalCOFI time series (1951 to 1969) of sized larvae of northern anchovy and Pacific sardine were com- pleted this month by D. Roll, N. Wiley, R. Parrish and B. B. Burris of the Automated Data Processing unit at the La Jolla Laboratory. There are five computer runs which characterize each species. The first table contains larval counts standard- ized to number per 10 sq m for each station and primary regional data summaries by month, quarter and year. The primary data summaries contain the mean number of larvae per positive station and the point of positive stations. The second table contains parameter estimates for the normal, log-normal, binomial, and negative binomial distribution by region and quarter. Each arithmetic mean is here weighted to the area of the region. The third table contains only seasonally weighted total estimates of larvae by region. The fourth table contains the regional time series for all regions and the weighted totals for the entire survey area for each quarter. The fifth table contains the catch rate of each size by time of day.\nA second series of tables will be created which is corrected by current estimates of the known biases in the collection technique. The smaller sizes of larvae will be adjusted to compensate for the tendency for the larvae to be extruded or escape through the meshes of the net. The larger sizes of larvae will be adjusted to compensate for the tendency of larvae to be taken in fewer tows in the daytime and for the larvae to be taken in smaller numbers in daytime tows. All sizes will be adjusted to reflect differing growth rates at different temperatures. A document is now being prepared by Lt. Roger Hewitt, NOAA Corps officer at the La Jolla Laboratory, to outline these corrections to known biases. These adjusted runs will be available as a tape and a printed output by October. Speci- mens of recent data are also available for jack mackerel, Pacific mackerel, and Pacific hake.\nJoint Aerial and Acoustic Anchovy Surveys Planned\nAt a recent State/Federal anchovy workshop joint aerial and acoustic surveys were discussed and a cruise has been planned for August 1975, by James Squire, Fishery Biologist and Lt. Roger Hewitt, NOAA Corps on detail to the La Jolla Laboratory, to conduct such work. Recent discussions with Mr. David Cram of the Republic of South Africa have highlighted the difficulty of using echo integration for surface\n18\nschooling fishes like the anchovy. The planned cruise on the NOAA research vessel, David Starr Jordan, will combine aerial observations with echo sounding, underwater photography, and sonar mapping. In- formation needed to manage fisheries for anchovies, sardines, mackerel and jack mackerel off South Africa is obtained from catch analysis and egg and larval, aerial, and acoustic surveys.\nDaily Ring Measurements in Larval and Juvenile Anchovies Can be Used to Determine Date of Birth\nDr. E. Brothers of the Inter-American Tropical Tuna Commission, Dr. Christopher Mathews of the Ciencias Marinas of Baja California, and Dr. Reuben Lasker of the La Jolla Laboratory have worked out a technique which can be used to determine the age of larval and juvenile anchovies very precisely. Mr. David Kramer, Fishery Bio- logist at the La Jolla Laboratory, is presently working with Dr. Mathews to learn the technique and plans to apply it to establish the dates of birth of individuals from incoming year classes of fish. The technique will provide information on whether survival of anchovy larvae occurs in restricted time periods or whether it is spread out evenly over the entire spawning period. Eventually, the information might be correlated with the earlier appearance and disappearance of suitable food for the larvae and the appearance of their predators in the spawning areas.\nTechniques Under Development to Study Structure of Food Patches for Larval Anchovy in the Sea\nDr. R. Owen, Oceanographer at the La Jolla Laboratory, completed laboratory tests of underwater television to detect microdistri- bution of plankton organisms. Dark-field lighting proved to be the most effective - individual organisms as small as 200 microns could be tracked individually on the monitor screen, and \"clouds\" of phytoplankters as small as 20 microns could be seen clearly using a dark background and side lighting. Results suggest that character- istic movements of individuals can be used to identify the type of plankter even when the individual's image was not clearly resolved. Lighting conditions similar to those used in laboratory tests can be duplicated at sea by careful rigging of the camera, backdrop, and light source for lowering or towing slowly to examine small- scale changes in plankton concentration over small vertical or horizontal distances as a guide to further quantitative sampling by other methods.\n19\nDr. Owen has also completed construction and dry testing of the microgradient sampler (which obtains water samples at 20 cm intervals vertically) as reported in previous monthly reports. Plans were made for testing the device at sea in July and for measuring vertical gradients of concentrations of phytoplankton, particles, nutrients and plant pigments over vertical distances of 200 cm. Variations of these gradients can be used to describe microdistribution and to calculate vertical fluxes given in addition to measurements of current shear and density gradients.\nPlant pigment samples from current CalCOFI cruises were analyzed during the month under Dr. Owen's direction by Technicians Marcia Pollock and Dan Berry. The samples will be used to convert in vivo fluorescence records from southern California Bight pump stations to chlorophyll a values for the assessment of food rations available to fish larvae.\nStudies Continue on Invertebrate Predators of Anchovy Larvae\nDr. Angeles Alvarino, Fishery Biologist at the La Jolla Laboratory, continued her studies on the invertebrate predators of anchovy larvae. Analyses of plankton samples of CalCOFI Cruise 5601 have been completed and Cruise 5602 is now being examined. From these studies, Dr. Alvariño determines the numerical abundance of Chaetognatha, Siphonophorae, Chonrdrophorae and Ctenophora, together with information on other zooplankters present in the collections. The number of specimens of Chaetognatha for each of the species present is determined as is the stage of maturity of each species, together with the size range of the individuals found at each stage of maturity. Siphonophorae abundance is determined for each repre- sentative at various stages of the life cycle, for each of the species observed. Information is also being obtained on the number of specimens per species of Medusae, Chrondrophorae, and Ctenophora, at the various stages of their life cycles and their respective size range. Counts are also made on the number of specimens with fish larvae in their digestive tracts, including identification of the predator and prey, and their sizes and stage of development.\n20\nDr. Alvariño found 11 species of Chaetognatha, 17 species of Siphonophorae, 9 species of Medusae, and one species of Ctenophora in the 5601 samples. Pyrosomes were also abundant in the 5601 material, with some samples containing more than 100 specimens each at sizes ranging from 5 to 50 mm. Large salps, up to 150 mm were also observed.\nGuide to Scorpionfish Larvae in Final Stage\n\"A guide to the identification of Scorpionfish larvae (family Scorpaenidae) in the eastern Pacific with comparative notes on species of Sebastes and Helicolenus from other oceans\" is being edited and the introductory section of the guide considerably enlarged by the author, Dr. G. Moser, Fishery Biologist at the La Jolla Laboratory. Previous to preparation of the guide, complete life history series from newly-hatched larvae through the larval and pelagic juvenile stage to the demersal juvenile stage were available for Sebastes paucispinis (Moser, 1967), Sebastes macdonaldi (Moser, 1972) and the 2 eastern Pacific species of Sebastolobus (Moser, 1974). The guide will include 2 additional life history series for commercially important species of Sebastes off California - S. jordani and S. levis, 3 series of Sebastes from the Gulf of California including S. cortezi, 3 series of Sebastes from the North Atlantic - S. marinus, S. viviparous and S. fasciatus, 2 series each for Pontinus and Scorpaena and 1 series each for Scorpaenodes, Helicolenus and Ectreposebastes.\nDr. Moser has found that larvae obtained from full-term female Sebastes have already developed distinctive tail pigment but had not as yet developed the pigment pattern on the head, pectoral fins or larvae jaw, that they will have as early stage pelagic larvae. Even so, the tail pigment can be very useful in distin- guishing among Sebastes larvae. The tail pigment is arranged in a series of melanophores along the ventral midline in all species of Sebastes and in over one-third of the species in a dorsal midline series of melanophores as well. Information on midline melanophores on the tail pattern of the body is included for full-term larvae of species of Sebastes from the eastern North Pacific. The average number of melanophores in the ventral midline series in species that had the dorsal series of melanophores range from 8 (S. melanostomus and S. macdonaldi) to 22 (S. umbrosus). In species that have both dorsal and ventral midline pigments, the ventral count is usually much higher than for species having the dorsal row exceeding 40 melanophores in over half of the species having both series.\n21\nMr. David Misitano, Fishery Biologist at the Northwest Fisheries Center spent 3 weeks at the Center during June studying identi- fication of fish eggs and larvae with Dr. Ahlstrom and his staff.\nCalCOFI Atlas Dealing with Flatfish Larvae\nin Preparation\nAnother in the series of CalCOFI atlases dealing with distribution of fish larvae on CalCOFI cruises is being prepared for flatfish larvae by Dr. E. Ahlstrom, Senior Scientist at the La Jolla Lab- oratory. Two genera and six species will be included in the atlas as follows: Citharichthys spp., Pleuronichthys spp., Citharichthys stigmaeus, Paralichthys californicus, Lyopsetta exilis, Parophrys vetulus, Microstomus pacificus, and Glyptocephalus zachirus. The 6 year period, 1955-1960, the period for which individual status records for these species are most readily available, are being covered in the atlas. The distribution records were compiled by Dr. E. Ahlstrom, and Biological Technician Elaine Sandknop who verified several dozen records that were questionable, a necessary quality control procedure. About half of these proved to be valid records, the other half were misidentifications. The atlas will give monthly distributions for the several flatfish that are taken most commonly in CalCOFI collections, and for less common forms, distribution will be compiled by quarters, or by 4-month groupings. The atlas will follow the procedure established for CalCOFI Atlas #17, which provided information on 6 common mesopelagic species, including illustrations for each species and a brief description of its distinc- tive larval features. The distribution charts which have already been roughed out by the Scripps Institution of Oceanography are ready for preparing in final form. Mr. John Wylie of Scripps is super- vising the preparation of the distribution charts.\nIt has often been pointed out that 12 kinds of larvae (10 species, 2 genera) contribute about 90% of the larvae taken on CalCOFI cruises. With the completion of this atlas, distribution charts of 11 of these 12 kinds will have been covered in CalCOFI atlases. Only rockfish larvae, Sebastes spp., have yet to be covered in CalCOFI atlases.\nStudy to Examine Usefulness of Mathematical Technique for Analysis of Catch per Unit Effort Data\nMr. J. Zweifel, Mathematician and Dr. Paul Smith, Fishery Biologist at the La Jolla Laboratory have initiated a study to examine the\n22\nusefulness of the negative binomial distribution in relation to several aspects of the analysis of what may be described generally as catch per unit effort data used widely to estimate the abundance of populations. In operational fisheries, effort fluctuates widely in response to a variety of physical, environ- mental, economic, areal and temporal constraints. In scientific surveys, attempts are made to make the effort as uniform as possible to insure that the effective unit of effort does not change. Operationally, this becomes an impossible task since surveys must be carried out under limitations very similar to those encountered in commercial or recreational fisheries. Thus the problems inherent in data reduction are common to both scientific investigations and fishery statistics.\nUsually, measures of central tendency (mean) and variability (variance) are desired. Most analysis techniques require some assumptions about the universe or populations from which the samples (catch) were collected, such as the nature of the vari- ability (additive or multiplicative) and the general form of the frequency distribution. The extreme characteristics with which one must deal are strongly right skewed distributions or a large zero class. The first eliminates the normal and the second presents difficulties with the log-normal, the two most widely used distri- butions. This study will examine the negative binomial distribuion, al intermediate alternative having much theoretical appeal and most often found when fish are forming schools or shoals as a basis for statistical analysis. Recently, published work has pointed the way toward utilizing this model with variable size of experiment (effort).\n*\nMr. James Squire, in charge of compiling statistics for the Coopera- tive Marine Gamefish Tagging Program at the La Jolla Laboratory, reports that during the first half of 1975 a total of 947 fish have been tagged and released using equipment furnished the laboratory. The billfish season at the tip of Baja California is still continuing and with the black marlin fishery scheduled to start off Cairns, Australia in September, it appears that the number of billfish reported tagged in 1975 should equal or exceed the number tagged in 1974.\nThe total number of fish reported tagged consists of 538 striped marlin, 279 black marlin, 10 blue marlin and 54 sailfish. A total of 66 other species were tagged, ranging from mako sharks off New Zealand to white sturgeon in San Francisco Bay.\n23\n* *\nPreliminary counts of fishing effort and numbers of billfish caught during 1974 are being made by Mr. Squire from information supplied by anglers responding to the billfish angler survey postcard form. The postcard form was distributed to 1,800 anglers together with the annual tagging reports prepared by Mr. J. Squire. In addition, 7,000 postcards were distributed by the International Gamefish Association to angler clubs throughout the world. The postcard form requests information from anglers on the number of days fishing in 1974 by quarter, and the catch of billfish, by species and by quarter.\nThe total number of anglers reporting billfish catches through- out the Pacific is 766 as of this date. This survey has been conducted annually since 1969 by Mr. Squire. This year it is expected that with the active cooperation of the International Gamefish Association, the 1975 angler response will be the largest ever.\nTUNA ASSESSMENT AND DEVELOPMENT INVESTIGATIONS\nThreadfin Shad Tested as Live Bait in Hawaii's Skipjack Tuna Fishery\nThe Honolulu Laboratory and the Vocational Technology Department of Leeward Community College have joined forces to test the feasibility of threadfin shad as live bait for the Hawaiian skipjack tuna fishery. The initial plan is to take approxi- mately 150 buckets (1,500 pounds) of shad from Wahiawa Reservoir weekly during the month of June. These fish are being made available to local fishing vessels after acclimatization to salt water at the Honolulu Laboratory's Kewalo Basin Facility. The object of this undertaking is to give the threadfin shad a thorough test as skipjack tuna live bait during the summer months. So far this year, however, most of the available skipjack tuna have been small fish and even they are scarce. Ideally, shad should be tested during peak fishing when fish are running larger. Commercial fishing vessels, Easy Rider, Anela, Kilohana and Electa have all taken shad to sea. None of the skipjack tuna fishing boats are returning with good catches at present, regardless of the bait they are carrying.\n24\n* *\nThe baitfish transport project is gearing up in Tiburon, where Fishery Biologist Roger Green of the Honolulu Laboratory is preparing for further holding experiments using northern anchovy. He is purchasing tanks, plumbing supplies, and other materials necessary to the construction of the facilities. Actual experi- ments to test the effects of handling methods, salinity levels, and density of packing on anchovy survival are expected to begin by mid-July. Mr. Green is being assisted by two temporary employees, Messrs. Smith and Goddard.\nSkipjack Tuna Population Dynamics Literature Search Completed for Overiew\nThe major research emphasis of the Tuna Monitoring and Assessment Task is on fishery analysis of the skipjack tuna resource in the Pacific and Indian Oceans. In addition, the status of exploited stocks of other tuna and tuna-like resources that are of U.S. concern are monitored through the systematic collection and analysis of fisheries data. Continuing the assessment of skipjack tuna resources, Task Leader Dr. Robert Skillman completed the literature search for an overview of population dynamics of skipjack tuna. This overview will be part of a report on the fishery biology of skipjack tuna being prepared by Mr. Walter Matsumoto, Fishery Biologist in the MARMAP III Task.\nExamination of Solomon Islands Skipjack Tuna Catch and Effort Statistics\nAt the request of the Honolulu Laboratory Director, Fishery Biologist Richard Uchida studied catch and effort statistics collected in the skipjack tuna fishery in the British Solomon Islands Protectorate, and drafted recommendations for analysis of the data. Mr. Uchida also collaborated with several staff members in designing two new forms for use in the shad-anchovy testing program. Called the Aku Boat Interview Record and the Aku Boat Observation Record, these forms will be put to use immediately by Investigation personnel.\n25\n* *\nFishery Biologist Howard Yoshida has begun preparation of \"status reports\" on the bonitos and the little tunas of the world. Two reports are planned, one on bonitos and the other for the little tunas; they will be prepared to facilitate the work of the FAO Working Party on Development of Fisheries on Species of Small Tunas and Related Species.\nHawaii's \"Season\" Skipjack Tuna are Straggling Into the Fishery\nThe catch of skipjack tuna in the Hawaiian pole-and-line fishery reached an estimated 325.1 metric tons (MT) in June. This is 206.9 MT below the catch in June 1974 and 441.0 MT lower than the June average for the years 1948-74. The catch for the first 6 months of 1975 is estimated at 1,165.6 MT, 461.8 MT below last year's catch for the same period and 676.0 MT below the long-term average.\nDuring the period May 19 to June 27, the lengths of 1,603 albacore from 34 fishing vessels were recorded in Pago Pago by Government of American Samoa employee Pulou Niuatoa. He also collected 40 sets of catch and effort data. Utilizing data from only seven vessels, an average size of 85.3 cm was determined together with an albacore catch per 100 hooks of 0.61.\nENDEX/OASIS Computerized Referral Service Available at NOAA Environmental Data Service/National Oceanographic Data Center Liaison Office at Southwest Fisheries Center\nMr. Nelson Ross, EDS/NODC Liaison Officer at the Southwest Fisheries Center in La Jolla, announced this month that direct computerized referral access to the ENDEX (Environmental Data Index)/OASIS (Oceanic and Atmospheric Scientific Information) is available through\n26\nhis office at the Center. ENDEX/OASIS provides rapid computerized referral to available environmental data and information files of NOAA, other Federal agencies, state and local governments, and private industry. Subject areas include aeronomy, cartography, climatology, coastal zone management, environment-related engineering, geodesy, hydrography, marine geography, meteorology, oceanography, and space and solar science.\nENDEX contains computer-searchable descriptions of interdisciplinary files of environmental data on many levels. OASIS is a computerized information retrieval service that provides ready reference to the technical literature and to research in environmental sciences and marine and coastal resources. OASIS offers access to major meteor- ological and oceanic bibliographic information files not available anywhere else in the U.S. in computer-searchable form.\nComputerized data bases available exclusively through ENDEX/OASIS are: Aquaculture Information System; Biological Information Retrieval System; Environmental Data Base Directory; Meteorological and Geo- astrophysical Abstracts; NODC Index for Instrument Measured Subsurface Current Observations; Oceanic Index; Bottom Photograph Camera Station File. In addition, other computerized data bases, such as air- pollution abstracts, and 24 others, are available through ENDEX/OASIS.\nFor descriptions of the data bases, information and/or demonstrations of the ENDEX/OASIS system, those interested should contact Mr. Ross at the Center (telephone number 453-2820, etc. 204).\nPUBLIC RELATIONS - SOUTHWEST FISHERIES CENTER\nJune 18 Mr. Robert Nishimoto, Fishery Biologist, La Jolla Laboratory, was host to Mr. William Fuselman and 20 students from Mt. Miguel High School in San Diego. Mr. Nishimoto discussed albacore research and the results of cooperative work with the American Fishermen's Research Foundation.\nJune 26-29 The first three panels of a six-panel permanent dis- play being prepared at the Honolulu Laboratory have been completed and were exhibited at the Hawaii Outdoor Sports Show at the Ala Moana Shopping Center.\n27\nJune 27 Thirty participants in the East-West Center's Prawn Farming Systems : Techniques Workshop were brought to the Honolulu Laboratory library by workshop coordinator Richard Gibson. Members of the group, representing Indonesia, Israel, Malaysia, Mexico, Philippines, Singapore, Sri Lanka, Thailand, and the United States, will be utilizing the Honolulu Laboratory library resources during the period of the workshop, June 25 to September 5.\nThe following press release was issued to West Coast news sources by the Southwest Fisheries Center in June:\nJune 18 Improved Albacore Fishing Predicted off Central and Southern California\nSEMINARS\nHonolulu Laboratory\nJune 4 Dr. Robert A. Skillman, Fishery Biologist with the Honolulu Lagboratory, spoke to the staff on \"Growth of skipjack tuna in Hawaiian waters, based on capture- recapture data.\"\nJune 6 Dr. Garth Murphy, CSIRO, Australia, gave an informal quick rundown on the Australian fisheries scene.\nJune 18 Dr. John E. Bardach, Director, Hawaii Institute of Marine Biology, spoke on \"Constraints of aquatic animal husbandry\" in the seminar room of the Honolulu Laboratory.\n28\nMEETINGS AND TRAVEL\nJune 2 A majority of the Honolulu Laboratory staff members went on an all-day field trip to the Hawaii Institute of Marine Biology and the Naval Undersea Center.\n2-3 Mr. Norman J. Abramson, Tiburon Laboratory Director, attended a meeting of the Southwest Fisheries Center, La Jolla, of the State/Federal Steering Committee.\n3 A State/Federal Resource Assessment Project meeting was held to discuss contracting arrangements and the direction of further research on sportfish species, during the next fiscal year at the SWFC. The meeting was attended by representatives of the California Department of Fish and Game, the Southwest Region, and Messrs. Lasker, Mackett, Stauffer and MacCall (California Department of Fish and Game Biologist at the SWFC).\n5 Mr. Richard Shomura, Director, Honolulu Laboratory, attended a meeting of the Natural Area Reserves Commission.\n6 Mr. Shomura attended a farewell luncheon for Dr. Jack Davidson, who is leaving his directorship position at the University of Hawaii Sea Grant Programs in mid-July.\n8-15 Dr. Edmund S. Hobson, Tiburon Laboratory, attended the annual meeting of the American Society of Ichthyologists and Herpetologists at Williamsburg, Virginia, where he presented a paper on feeding relationships of fishes at Catalina Island, California.\n15-19 Mr. Susumu Kato, Tiburon Laboratory, travelled to Puget Sound to meet with various people engaged in salmon culture and research. He visited with personnel of the Northwest Fisheries Center, University of Washington, and the Washington Department of Fisheries. Mr. Kato made on-site inspections of salmon rearing facilities of Domsea and Weyerhauser companies.\n16-20 Center Director Rothschild travelled to Washington, D. C. to attend the Regional/Center Directors' Meeting.\n29\nJune 17 A meeting of the California Marine Research Committee which sponsors the California Cooperative Oceanic Fisheries Investigations (CalCOFI) was held at the Center. The Committee discussed in detail cooperation with the Mexican government on fisheries research problems of mutual interest in the CalCOFI area (from off northern California to the tip of Baja California, Mexico, and seaward 200 miles) and endorsed proposals for joint research to be presented at the forthcoming meeting of Mexican scientists and representatives of CalCOFI, including Dr. Reuben Lasker for the NMFS Southwest Fisheries Center, in Mexico, June 26-27.\n17-22 Dr. Geoffrey Moser of the La Jolla Laboratory travelled to Boulder, Colorado to attend a conference of review- ers for DOMES research grants.\n18 Mr. Shomura and Mr. Tamio Otsu met with Dean Ken Kamimura of Leeward Community College regarding LCC students' involvement in our shadding project.\n19-20 Mr. Shomura attended the Pacific Tuna Development Founda- tion meetings at the Hawaii State Capitol.\n20 The Salmon Rearing Committee, consisting of personnel from the Tiburon Laboratory, Sea Grant Program, and the Tyee Club, held its regularly scheduled meeting.\n20 Dr. Jeannette Struhsaker and Maxwell Eldridge visited the Southwest Fisheries Center, La Jolla Laboratory, to discuss striped bass research with Drs. Reuben Lasker, John Hunter and Krishna Lal (the latter a Fishery Biologist with the California Department of Fish and Game).\n23 Dr. William Lenarz, in charge of the Porpoise/Tuna program at the La Jolla Laboratory, attended a Marine Mammal Commission-sponsored workshop on Tursiops truncatus (bottlenose dolphin) stock assessment in Miami. The group discussed research needs and gave highest priority to an aerial survey of the Florida stocks of Tursiops.\n30\nJune 23 Mr. Steven C. Tator, Investigator, and Ms. Blanche Deight of the Federal Trade Commission, Los Angeles, met with Mr. Shomura, Director at the Honolulu Laboratory, during the course of their investigation of the tuna industry relative to anti-trust activities.\n24-25 The Tuna Policy Committee, appointed by NMFS Director Shoning recently to advise him on tuna-related pro- grams and policy, chaired by Brian J. Rothschild, SWFC Director, met at the Center to discuss procedures and outlined as an important first priority the need to express to Mr. Schoning the various views of the tuna industry. As Chairman, Dr. Rothschild sent a letter to top industry officials asking that they meet with him and Committee members Gerald V. Howard, Southwest Regional Director, and Carmen Blondin, Vice Chairman, Assistant Director for International Fisheries, to discuss present problem areas and future problems that may arise in the tuna industry in the future. A series of meetings with industry officials is in progress.\n25 Mr. Shomura attended the opening ceremony of the Prawn Workshop at the East-West Center. The Prawn Farming Systems: Techniques Workshop runs from June 25 to September 5 and is jointly sponsored by the Food Institute of the EWC and the Hawaii Division of Fish and Game.\n27\nMr. Shomura called a meeting of the ad hoc Baitfish Committee to discuss the results of the recent PTDF meeting and future plans for baitfish activities in Hawaii.\n30\nCenter Director Rothschild and Mr. D. Mackett attended a State/Federal Steering Committee meeting at Terminal Island. Terms of the reference of the Committee will concern coordination of joint State/Federal fisheries research in the future.\n31\nVISITORS\nHonolulu Laboratory\nJune 5 Mr. Stetson Tinkham, NMFS, Washington, D.C.\n6 Ms. Eileen Lum. Leeward Trollers, Honolulu\n10 Mr. Wayne Baldwin, HIMB, Kaneohe\nMr. Rich Braley, fisheries Division, Department of Agriculture, Nuku'alofa, Tonga\n16 Mr. Ray Rounds, Kailua High School, Kailua, Oahu\n26 Mr. Dougles Weber, NMFS, Seattle, accompanied by Mr. Henry Sakuda, Hawaii Division of Fish and Game\nLa Jolla Laboratory\n2 Mr. Peter Castle, University of New Zealand, Wellington, New Zealand\n4 Dr. Robert F. Dill, Environmental Coordinator, Department of Interior, Washington, D.C.\n9 Mr. Robert L. Ward, Porter Junior High School, Fallbrook, California\n16 Mr. Fred Weiss, Research Chemist, Shell Development Company, Houston, Texas\n18 Professor A. Takagi, Fishing Boat Association of Japan, Tokyo\nMr. G. Ueta, Miho Shipyard Co., Shimizu, Japan Mr. A. Kasahara, Kanesashi Shipbuilding Co., Ltd., Shimizu, Japan\n32\nJune 18\nMr. K. Baha, Furuno Electric Co., Nishinomiya, Japan\nMr. T. Sugimura, Miho Shipyard Co., Ltd., Shimizu, Japan\nMr. T. Harumoto, Yanmar Diesel Engineering Co., Osaka, Japan\n20 Dr. J. Struhsaker and Mr. Mickey Eldridge, SWFC, Tiburon Laboratory to discuss the striped bass program, slated to begin at Tiburon July 1\n22-30 Mr. Izadore Barrett, SWFC Deputy Director, now attending the University of Washington, College of Fisheries, during a year's educational leave, visited the Center for discussions of pending fisheries matters\n24-25 Mr. Fred L. Olson, NMFS, Washington, D.C.\nMr. Gerald V. Howard, NMFS Southwest Region, Terminal Island, California\nMr. Carmen J. Blondin, NMFS, Washington, D.C. to attend Tuna Policy Committee meeting. Other members of the Committee are Dr. B. Rothschild, Chairman; Mr. W. Van Campen, NMFS Liaison for the PIDC; and Dr. D. Huppert, Executive Secretary of the Committee, of the La Jolla Laboratory\nTiburon Laboratory\nJune 5 Don Aasted, Methods and Equipment Specialist, Honolulu Laboratory, Honolulu, Hawaii\n6 George Barber, Plans and Policies, NMFS, Washington, D.C.\nJim Slawson, Fishery Biologist, Southwest Region, Terminal Island, California\nFritz Cramer, Resource Management Administrator, Southwest Region, Terminal Island, California\n33\nJune 9 Robert Rawstron, California Department of Fish and Game, Sacramento, California\n20 Carl Eschler, President, Tyee Club, San Francisco, California\nRobert Brown, Tyee Club, San Francisco, California Sam De Mero, Tyee Club, San Francisco, California Stan Hearst, Tyee Club, San Francisco, California Frank Dyer, Tyee Club, San Francisco, California Chris DeWees, Sea Grant Program, University of California at Davis, Davis, California\nBruce Wyatt, Sea Grant Program, University of California at Davis, Davis, California\nFrank Corbelli, Tyee Club, San Francisco, California\n23 James Mullick, U.S. Coast Guard Marine Science, San Francisco, California\n26 Dr. Bruce Collette, Scientific Editor, NMFS, Washington, D.C.\nPERSONNEL\nLaboratory\nJune 6 Cynthia Unninayar, Physical Science Technician, Termination of Temporary Appointment Honolulu\n9 John Thompson, Biological Aid, Termination La Jolla\n16 Hilary Hogan, Physical Science Aid, Pay Adjustment La Jolla\n22 Ronald C. Dotson, Biological Technician, Promotion La Jolla\n34\nLaboratory\nJune 23 Lloyd P. Blaine, Biological Aid (Fisheries), Career Conditional Appointment Honolulu\n23 Jeffrey H. R. Goddard, Bio- logical Aid (T), Temporary Appointment Tiburon\n25 Oliver Seth, Biological Aid, Termination La Jolla\n28 Helen Caouette, Clerk-Typist, Resignation La Jolla\n30 Vince Di Meo, Summer Aid, Temporary Appointment La Jolla\n30 Antoinette Banda, CETA Enrollee, Termination\nHonolulu\n30 George W. Rommel, Biological Technician (T), Termination Tiburon\n30 Vance E. McClure, Research Chemist, Termination Tiburon\n30 Stephen C. Schroeter, Biological Technician (T), Termination\nTiburon\nAfter a six-month detail at the Southwest Fisheries Center as Acting Deputy Center Director, Mr. Robert F. Scott left the Center on June 20 to take up his newly assigned duties as Acting Deputy Associate Director for Resource Research, Washington, D. C.\n35\nTRAINING\nJune 15-20 Dr. Paul Smith attended a week-long leadership laboratory for managers and supervisors at Ojai, California. The training session was conducted by University of California at Los Angeles staff under a contract with the U. S. Civil Service Commission. .\n17-20 An 8-hour Basic Live Support Course in \"Cardio- pulmonary Resuscitation\" was presented at the Southwest Fisheries Center's La Jolla Laboratory by the American Red Cross. Those completing the course were C. Hill, H. Hogan, K. Lewandowski, R. Nishimoto, J. MacGregor, G. Sakagawa and R. Sheppard\n10-13 Civil Service Commission course, San Francisco, \"Technical Writing\", Maxwell B. Eldridge, Fishery Biologist, Tiburon Laboratory\n25-27 Civil Service Commission course, San Francisco, \"Writing Effective Letters\", Tina Echeverria, Fishery Biologist, Tibruon Laboratory\nHONORS AND AWARDS\nOutstanding Performance Rating with Quality Step Increase, Dr. Edmund S. Hobson, Tiburon Laboratory\nSpecial Act Awards of $200.00:\nNina Hirsch, Biological Technician, Tiburon Laboratory\nTina Echeverria, Biological Technician, Tiburon Laboratory\n36",
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                    "content": ". 11",
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                    "content": "alalunga (Bonneterre) and coastwide albacore fishery data",
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                {
                    "content": "for",
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                {
                    "content": "research",
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                {
                    "content": "projects",
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                    "content": "underway",
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                    "content": "involving",
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                    "content": "analysis",
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                {
                    "content": "of",
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                {
                    "content": "tissue,",
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                {
                    "content": "trace",
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                },
                {
                    "content": "metals,",
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                {
                    "content": "and",
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                    }
                },
                {
                    "content": "otoliths.",
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                },
                {
                    "content": "Nine",
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                    "confidence": 0.992,
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                },
                {
                    "content": "neuston",
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                },
                {
                    "content": "tows",
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                },
                {
                    "content": "were",
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                    "confidence": 0.992,
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                    }
                },
                {
                    "content": "taken.",
                    "polygon": [
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                },
                {
                    "content": "3",
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            ],
            "lines": [
                {
                    "content": "ALBACORE FISHERIES INVESTIGATIONS",
                    "polygon": [
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                    ]
                },
                {
                    "content": "NMFS Scientists on NOAA Research Vessel, Cromwell",
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                        }
                    ]
                },
                {
                    "content": "Investigate Offshore Distribution of Albacore Tuna in",
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                        }
                    ]
                },
                {
                    "content": "Relation to Oceanographic Features",
                    "polygon": [
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                            "length": 34
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                    ]
                },
                {
                    "content": "The recently reactivated NOAA research vessel, Townsend Cromwell,",
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                    ]
                },
                {
                    "content": "departed Seattle, Washington on June 19 on a survey to examine the",
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "offshore distribution of albacore tuna in relation to oceanographic",
                    "polygon": [
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                    "spans": [
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                        }
                    ]
                },
                {
                    "content": "features during the period of onshore migration. (The objective and",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "background of this cruise were reported in the SWFC Monthly Report",
                    "polygon": [
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                        }
                    ]
                },
                {
                    "content": "for April.)",
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                        }
                    ]
                },
                {
                    "content": "Mr. Ron Lynn, Oceanographer at the La Jolla Laboratory,",
                    "polygon": [
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                    "spans": [
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                    ]
                },
                {
                    "content": "was the head of the scientific party on the Cromwell.",
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                    ]
                },
                {
                    "content": "Salinity-temperature-depth (STD) hydrographic stations to 1,000 m",
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                    "spans": [
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                    ]
                },
                {
                    "content": "were taken along most of the cruise track between the Straits of Juan",
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                    "spans": [
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                            "offset": 8835,
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                        }
                    ]
                },
                {
                    "content": "de Fuca and Honolulu. A transect between 40° and 30º N along",
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                    "spans": [
                        {
                            "offset": 8905,
                            "length": 60
                        }
                    ]
                },
                {
                    "content": "137°30' W, which had been taken in the three previous years was",
                    "polygon": [
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                    "spans": [
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                            "offset": 8966,
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                        }
                    ]
                },
                {
                    "content": "repeated. Along this transect the subtropic front was found at 32º10' N",
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                        {
                            "offset": 9030,
                            "length": 71
                        }
                    ]
                },
                {
                    "content": "-- a similar position to previous years. However, the subarctic front",
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                        {
                            "offset": 9102,
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                        }
                    ]
                },
                {
                    "content": "was near 39º30' N, 100 miles further north than in 1972 and 1973. The",
                    "polygon": [
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                    "spans": [
                        {
                            "offset": 9172,
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                    ]
                },
                {
                    "content": "average depth of the 33.8º/o. isohaline which falls in the halocline of",
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                    ]
                },
                {
                    "content": "the subarctic was 150 m compared to 200 m for the earlier years; thus",
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                    ]
                },
                {
                    "content": "the front did not extend as deep this year.",
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                        }
                    ]
                },
                {
                    "content": "In 1974 the subarctic front was diffuse and a remnant was found at",
                    "polygon": [
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                        {
                            "offset": 9428,
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                    ]
                },
                {
                    "content": "36°30' N. Although it is not warranted to make a definitive conclusion",
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                            "offset": 9495,
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                    ]
                },
                {
                    "content": "based on a single annual transect of these ocean features, it appears",
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                            "offset": 9566,
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                        }
                    ]
                },
                {
                    "content": "that the Transition Zone is half again as broad as in 1972 and 1973,",
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                            "offset": 9636,
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                    ]
                },
                {
                    "content": "and the northern boundary of the subarctic front not as strongly develop-",
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                        }
                    ]
                },
                {
                    "content": "ed. A situation somewhat similar to last year prevailed again this year.",
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                    ]
                },
                {
                    "content": "These conclusions are preliminary.",
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                        }
                    ]
                },
                {
                    "content": "Jig \"trolling\" using 10 lines was started when the Cromwell first en-",
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                        }
                    ]
                },
                {
                    "content": "countered sea surface temperatures in excess of 58ºF at 42°15' N,",
                    "polygon": [
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                },
                {
                    "content": "134°07' W; the first albacore were taken within an hour. Trolling was",
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                    ]
                },
                {
                    "content": "conducted along the entire 137°30' W transect (between 40° and 30º N).",
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                    ]
                },
                {
                    "content": "The ship lay-to during hours of darkness. In all, 113 albacore were",
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                },
                {
                    "content": "caught, 93 north of 35º N and 20 to the south. The largest number caught",
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                    ]
                },
                {
                    "content": "in one day was 48 at 38°30' N, 137°30' W. Fork lengths were measured",
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                },
                {
                    "content": "on all fish and muscle samples, intestines and heads were collected",
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                    ]
                },
                {
                    "content": "for research projects underway involving analysis of tissue, trace",
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                },
                {
                    "content": "metals, and otoliths. Nine neuston tows were taken.",
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                    "content": "3",
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            "words": [
                {
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                            "offset": 11036,
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                    ]
                },
                {
                    "content": "American Fishermen's Research Foundation Charter",
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                    ]
                },
                {
                    "content": "Vessels Complete Offshore Albacore Survey",
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                {
                    "content": "As part of the NMFS-AFRF cooperative albacore research studies, three",
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                },
                {
                    "content": "jigboats and one baitboat on charter to AFRF departed San Diego on",
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                    "content": "June 1 and June 5, respectively, to conduct exploratory albacore",
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                    ]
                },
                {
                    "content": "fishing and to tag albacore in the early-season offshore fishery.",
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                    ]
                },
                {
                    "content": "The first albacore was caught by these boats on June 2 about 125",
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                            "offset": 11443,
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                    ]
                },
                {
                    "content": "miles west-southwest of San Diego; however, no particular concentra-",
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                    ]
                },
                {
                    "content": "tions of fish were found. On June 7 the baitboat caught 50 fish",
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                            "offset": 11577,
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                    ]
                },
                {
                    "content": "(36 on jigs and 14 on bait) west of Guadalupe. One of the jigboats",
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                    ]
                },
                {
                    "content": "developed mechanical problems and headed for San Diego on June 12.",
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                    ]
                },
                {
                    "content": "Although the boats took some fish on most days their catches did not",
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                    ]
                },
                {
                    "content": "exceed 17 fish per day (except for the one day mentioned), until",
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                            "offset": 11844,
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                    ]
                },
                {
                    "content": "they reached 38º N in the offshore area during the last week of June.",
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                            "offset": 11909,
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                    ]
                },
                {
                    "content": "At that point their scores occasionally exceeded 100 fish per day.",
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                            "offset": 11979,
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                    ]
                },
                {
                    "content": "On june 29 the boats separated, one worked toward Astoria, Oregon and",
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                },
                {
                    "content": "the others worked toward San Diego, each arriving in port near the",
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                    "spans": [
                        {
                            "offset": 12116,
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                    ]
                },
                {
                    "content": "beginning of the second week in July.",
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                        {
                            "offset": 12183,
                            "length": 37
                        }
                    ]
                },
                {
                    "content": "The albacore were found scattered over a very broad region; some had",
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                        {
                            "offset": 12221,
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                        }
                    ]
                },
                {
                    "content": "moved close to southern California at an early date and a modest number",
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                        {
                            "offset": 12290,
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                    ]
                },
                {
                    "content": "were found much further north than in previous surveys. The ocean",
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                        {
                            "offset": 12362,
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                    ]
                },
                {
                    "content": "characteristics that likely influenced this distribution were the",
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                        {
                            "offset": 12428,
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                        }
                    ]
                },
                {
                    "content": "warmer-than-average temperatures in the offshore region, the broad",
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                            "offset": 12494,
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                    ]
                },
                {
                    "content": "spread of Transition Zone waters and the modest development of the",
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                    ]
                },
                {
                    "content": "subarctic front. The concentrating effect of the Transition Zone",
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                            "offset": 12628,
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                    ]
                },
                {
                    "content": "and the boundary fronts upon the albacore was more effective in 1972",
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                            "offset": 12693,
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                    ]
                },
                {
                    "content": "and 1973 when the Zone was more narrow and the fronts were stronger.",
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                    ]
                },
                {
                    "content": "4",
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                    ]
                }
            ],
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            ]
        },
        {
            "pageNumber": 9,
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            "unit": "inch",
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                {
                    "content": "COASTAL",
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                    "content": "FISH",
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                },
                {
                    "content": "COMMUNITIES",
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                {
                    "content": "INVESTIGATIONS",
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                {
                    "content": "Analysis",
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                {
                    "content": "of",
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                },
                {
                    "content": "Feeding",
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                {
                    "content": "Habits",
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                },
                {
                    "content": "Fishes",
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                },
                {
                    "content": "Foraging",
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                {
                    "content": "over",
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                },
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                    "content": "Sand",
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                },
                {
                    "content": "Bottoms",
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                },
                {
                    "content": "Continues",
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                },
                {
                    "content": "This",
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                },
                {
                    "content": "month",
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                    }
                },
                {
                    "content": "the",
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                },
                {
                    "content": "investigators",
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                },
                {
                    "content": "studying",
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                    }
                },
                {
                    "content": "nearshore",
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                    }
                },
                {
                    "content": "fish",
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                    }
                },
                {
                    "content": "communities",
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                    }
                },
                {
                    "content": "at",
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                    }
                },
                {
                    "content": "the",
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                },
                {
                    "content": "Tiburon",
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                },
                {
                    "content": "Laboratory,",
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                },
                {
                    "content": "Dr.",
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                },
                {
                    "content": "Edmund",
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                },
                {
                    "content": "Hobson,",
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                {
                    "content": "Project",
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                    "content": "relationships of fishes that forage over the open sand bottom",
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                    "content": "adjacent to the kelp forests.",
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                    "content": "The work has involved assessing the organisms living in the sand",
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                    "content": "that are prey of fishes, as sampled with a coring device. These",
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                    "content": "organisms include polychaetes, mollusks, ostracods, cumaceans,",
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                    "content": "amphipods, and mysids, all of which are being identified to species",
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                    "content": "were feasible. Close attention has been paid to the movements many",
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                    "content": "of these organisms make into the water column at night, as sampled",
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                {
                    "content": "with a plankton net.",
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                {
                    "content": "The feeding habits of the fishes that forage on and above the sand,",
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                {
                    "content": "most of them important recreational species, are being related to",
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                {
                    "content": "these prey occurrences and movements. Fishes under study that live",
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                },
                {
                    "content": "on the sand day and night include the California halibut, Paralichthys",
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                },
                {
                    "content": "californicus, the C-O Turbot, Pleuronichthys coenosus, and the speckled",
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                    ]
                },
                {
                    "content": "sand dab, Citharichthys stigmaeus. Fishes under study that forage",
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                    ]
                },
                {
                    "content": "over the sand at night after passing the day sheltered in the forest",
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                    ]
                },
                {
                    "content": "include the shiner surfperch Cymatogaster aggregata and the walleye .",
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                    ]
                },
                {
                    "content": "surfperch, Hyperprosopon argenteum.",
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                },
                {
                    "content": "COASTAL FISHERIES INVESTIGATIONS",
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                {
                    "content": "Vessel Continues to Catch Red Crabs",
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                    "content": "The commercial fishing vessel Lady Olga returned to port in San",
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                    "content": "Pedro with 76,000 1bs of pelagic red crabs, caught in international",
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                    "content": "waters off Baja, California. Fishery Biologist Susumu Kato of the",
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                    "content": "Tiburon Laboratory reports that this was the vessel's best trip; it",
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                    "content": "took only eight fishing days to catch, as well as grind and bag the",
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                    "content": "crabs.",
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                    "content": "tagged fish.",
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                    "content": "Feeding studies are being conducted in an effort to induce silver",
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                    "content": "salmon to feed on cheaper dry pellets. The fish are presently on a",
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                    "content": "Volunteer student Stanley Smith has isolated and cultured a disease",
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                    "content": "tuna.",
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                    "content": "meet with cartographer Jim Goodlin, (NOAA Visual Services), who is",
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                    "content": "preparing the Guide's 40 coastal fishing charts. They discussed",
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                    "content": "various ways of presenting the fishing information on the base",
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                    "content": "maps, and made final decisions on the layout of each fishing chart.",
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                    "content": "An effort is being made to make the charts not only readable, well",
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                    "content": "organized and attractive but also relatively inexpensive to print --",
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                    "content": "hopefully passing on the savings to the public when the book be-",
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                    "content": "comes available through GPO. The authors plan to have the Guide",
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                    "content": "ready for the printers in late fall.",
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                    "content": "FISH ENVIRONMENTAL INVESTIGATIONS",
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                    "content": "lower lethal temperature, an upper lethal temperature of 35º C",
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                    "content": "temperature, and oxygen levels at or slightly below 5 ppm. All",
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                    "content": "three values were empirically determined with captive tuna at",
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                    "content": "Honolulu Laboratory's Kewalo Basin Facility.",
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                    "content": "Since this approach proved so fruitful with skipjack tuna, and for",
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                    "content": "comparative purposes, the Experimental Ecology of Tunas group under",
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                    "content": "expanding its observations using yellowfin tuna while modifying",
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                    "content": "procedures to conserve supplies of hard-to-obtain yellowfin tuna.",
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                    "content": "excess body temperatures and coefficients of heating and cooling for",
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                    "content": "oxygen levels starting at saturation. Skipjack tuna are also tested",
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                    "content": "in order to have a measure with which to compare the behavior of the",
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                    "content": "yellowfin tuna. Fourteen skipjack tuna and four yellowfin tuna have",
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                    "content": "been tested. Although the supply of yellowfin tuna is too small to",
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                    "content": "do a credible low oxygen resistance study, one can get an idea of",
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                    "content": "the relative abilities of yellowfin tuna to withstand oxygen stress",
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                    "content": "when their performance is compared with skipjack tuna and speckled",
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                    "content": "trout. Consider the following observations and numbers: Yellowfin",
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                    "content": "(to 1.55 ppm) and then increasing oxygen levels lasting approximately",
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                    "content": "300 min; skipjack tuna in contrast dramatically increase swim speed",
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                    "content": "as oxygen drops 4 ppm and never survive the recovery. Showing no",
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                    "content": "yellowfin tuna survived 200 min at 1.4 ppm and 200 min at 1.6 ppm.",
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                    "content": "ably precise laps at 1.5 lengths/sec. Skipjack tuna cannot survive",
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                    "content": "these levels very long. Death occurred in 42 min at 1.7 ppm; 20 min",
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                    "content": "at 1.4 ppm; and 47 min at 2.6 ppm. Swimming speeds of skipjack tuna",
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                    "content": "increase up to about 3.5 lengths/sec at oxygen levels below 4 ppm.",
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                    "content": "Literature values for speckled trout LDFare 100 min at 1.4 ppm when",
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                    "content": "forced to swim at 1.5 lengths/sec.",
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                    "content": "It seems from these preliminary",
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                    "content": "data that yellowfin tuna has ability to withstand low oxygen stress",
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                    "content": "that is comparable to other nonscombrid fish.",
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                    "content": "If supplies of yellow-",
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                    "content": "fin become more plentiful, Dr. Dizon will measure routine respiration",
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                    "content": "rates and do a proper resistance study.",
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                    "content": "FEI Chief Dr. Richard Barkley completed a manuscript entitled \"Hypo-",
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                    "content": "thetical habitat of skipjack tuna based on temperature and oxygen",
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                    "content": "requirements.\"",
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                    "content": "Internal review has been completed and the draft is",
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                    "content": "being revised.",
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                    "content": "Instrument Designed to Facilitate Heat Transfer;",
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                    "content": "May Lessen Tuna \"Burn\"",
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                    "content": "Honolulu Laboratory Fishery Biologist Heeny Yuen is chief investiga-",
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                    "content": "Tuna Conference at Lake Arrowhead.",
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                    "content": "had an opportunity to discuss the problem with Mr. Harold Medina,",
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                    "content": "in San Diego.",
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                    "content": "far during the 1975 tuna fishing season, 28 trips have been",
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                    "content": "completed by NMFS porpoise observers on tuna vessels of the U.S.",
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                    "content": "fleet.",
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                    "content": "Another tuna seiner is due to leave port during July with a NMFS",
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                    "content": "gear research technician aboard. The ship will carry a porpoise",
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                {
                    "content": "apron, current indicator ribbons, and prototypes of the \"porpoise",
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                    "content": "grabber\" (a device to help guide porpoise out of the net). Final",
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                    "content": "arrangements are also being completed to place the NMFS large-",
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                    "content": "exceed",
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                    "content": "rate",
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                    "content": "last",
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                    "content": "year.",
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                    "content": "a",
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                    "confidence": 0.994,
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                {
                    "content": "total",
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                },
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                    "content": "34",
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                    "confidence": 0.995,
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                },
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                    "content": "U.S.",
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                    "content": "purse",
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                },
                {
                    "content": "seiners",
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                    "confidence": 0.994,
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                },
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                    "content": "reported",
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                    "content": "observations.",
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                    "content": "12",
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            ],
            "lines": [
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                    "content": "STOCK ASSESSMENT AND FISHERY EVALUATION INVESTIGATIONS",
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                    "content": "Two-a-Day Weather Advisories to be Continued",
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                    ]
                },
                {
                    "content": "by SWFC, La Jolla and NWS, Redwood City",
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                },
                {
                    "content": "In the May Monthly Report it was announced that SWFC would broad-",
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                {
                    "content": "cast, on a trial basis, a \"Wind and Weather Analysis and Advisory",
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                {
                    "content": "Chart\" in the morning at 1400 GMT (0700 PDT). After the trial",
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                {
                    "content": "period, (June 9 to 13), the favorable responses received from tuna",
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                },
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                    "content": "fishermen indicated that the early morning chart was a useful",
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                    "content": "service. It will, therefore, be continued indefinitely. The",
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                    "content": "major advantage of the new chart is that it incorporates more",
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                    "content": "recent information concerning the formation and movement of storms",
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                {
                    "content": "in the tropical Pacific. This is particularly valuable information",
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                    "content": "during the \"chubasco\" season.",
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                },
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                    "content": "The skipjack tuna stock of the Atlantic ocean has long been con-",
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                {
                    "content": "sidered an underexploited resource, but fisheries for this species",
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                },
                {
                    "content": "are developing rapidly. Fishery Biologist T. Murphy at the La Jolla",
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                    "content": "Laboratory is compiling data for a paper that will review the history",
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                {
                    "content": "of the skipjack fisheries and attempt to evaluate the status of the",
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                    "content": "present Atlantic stock. This work is part of the La Jolla Labora-",
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                    "content": "tory's effort in preparation for the 1975 ICCAT meeting to be held",
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                {
                    "content": "in November in Madrid, Spain.",
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                    "content": "Tuna Vessel Participation in Radio Weather",
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                    "content": "Reporting Program Remains High",
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                    "content": "The number of weather and XBT observations received by radio station",
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                {
                    "content": "wwd, La Jolla, continues to exceed the reporting rate of last year.",
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                    "content": "During June a total of 34 U.S. purse seiners reported observations.",
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                    "content": "12",
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            "pageNumber": 17,
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                    "content": "Observations",
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                    "content": "Total",
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                    "content": "Ocean Environment Related to Fishing Success in",
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                    "content": "on stock and recruitment, bio-economic and yield-per-recruit.",
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                    "content": "annual CalCOFI meeting in San Diego. The egg and larval survey",
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                    "content": "of Mortality in Jack Mackerel Larvae",
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                    "content": "swimming movements and/or the body cavity seemed to be bloated.",
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                    "content": "These specimens were also preserved.",
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                    "content": "at 16° C and at 4 weeks a few are still alive in the high density",
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                    "content": "Efforts Made to Replenish Spawning Stocks of",
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                    "content": "Mackerel at La Jolla Laboratory",
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                    "content": "made to capture new Pacific mackerel to replenish dwindling",
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                    "content": "spawning stocks at the La Jolla Laboratory. These fish are usually",
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                    "content": "found in the La Jolla kelp beds during the summer months and can be",
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                    "content": "caught with hook and line.",
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                    "content": "The fish being caught measure about 10",
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                },
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                    "content": "inches in total length and are too small to spawn, but should be",
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                },
                {
                    "content": "mature by the spring of the coming year. Enough mature fish remain",
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                    "content": "to fulfill any forseeable egg demands. A manuscript is being",
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                    "content": "prepared to describe the maturation of mackerel under different",
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                    "content": "light-temperature conditions in the laboratory.",
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                    "content": "The end result of the report is the formulation of a scheme to",
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                {
                    "content": "have ripe fish in the laboratory throughout the year and spawn them",
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                    "content": "on demand with gonadotropic agents. In nature, the Pacific mackerel",
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                },
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                    "content": "spawns off the southern California coast only during May through",
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                },
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                    "content": "August. It appears the temperature is far more important than the",
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                    "content": "photoperiod in regulating maturation and a high temperature, 19º C",
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                    "content": "or more, will accelerate egg development. However, prolonged ex-",
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                    "content": "posure to high temperatures also has a debilitating effect and the",
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                    "content": "state of health of the fish begins to decline in about 4 months with",
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                    "content": "eventual death in about 6 months. The fish develop more slowly",
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                },
                {
                    "content": "at 16° to 17º C but the mackerel remain healthier and a few are ripe",
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                    "content": "the year around. The ripe fish can be detected through a biopsy",
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                    "content": "technique and can then be spawned with a combination of hormone",
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                    "content": "and physical variables involved in the predation by fish on eggs",
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                    "content": "and larvae of the northern anchovy. Under construction are three,",
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                    "content": "10-foot diameter tanks which are manifolded together, each with",
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                    "content": "6-foot-long fiberglass troughs. This apparatus, when completed,",
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                    "content": "will permit maintaining a stock tank of predators in one tank,",
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                    "content": "and larvae from their maintenance tank to a third tank by move-",
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                    "content": "future field work such as determining the time a larva or egg can",
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                    "content": "remain in the gut of a predator and still be identified, and in-",
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                    "content": "Computer Runs of 25,000 CalCOFI Time Series of",
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                    "content": "pleted this month by D. Roll, N. Wiley, R. Parrish and B. B.",
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                    "content": "Burris of the Automated Data Processing unit at the La Jolla",
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                    "content": "Laboratory. There are five computer runs which characterize",
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                    "content": "ized to number per 10 sq m for each station and primary regional",
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                    "content": "data summaries by month, quarter and year. The primary data",
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                    "content": "summaries contain the mean number of larvae per positive station",
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                    "content": "and the point of positive stations. The second table contains",
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                    "content": "parameter estimates for the normal, log-normal, binomial, and",
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                    "content": "negative binomial distribution by region and quarter. Each",
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                    "content": "arithmetic mean is here weighted to the area of the region. The",
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                    "content": "third table contains only seasonally weighted total estimates of",
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                    "content": "larvae by region. The fourth table contains the regional time",
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                    "content": "series for all regions and the weighted totals for the entire survey",
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                    "content": "area for each quarter. The fifth table contains the catch rate of",
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                    "content": "each size by time of day.",
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                    "content": "A second series of tables will be created which is corrected by",
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                    "content": "current estimates of the known biases in the collection technique.",
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                    "content": "The smaller sizes of larvae will be adjusted to compensate for",
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                    "content": "the tendency for the larvae to be extruded or escape through the",
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                    "content": "meshes of the net. The larger sizes of larvae will be adjusted",
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                    "content": "to compensate for the tendency of larvae to be taken in fewer tows",
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                    "content": "in the daytime and for the larvae to be taken in smaller numbers in",
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                    "content": "daytime tows. All sizes will be adjusted to reflect differing growth",
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                    "content": "rates at different temperatures. A document is now being prepared",
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                {
                    "content": "by Lt. Roger Hewitt, NOAA Corps officer at the La Jolla Laboratory,",
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                    "content": "formation needed to manage fisheries for anchovies, sardines, mackerel",
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                    "content": "and jack mackerel off South Africa is obtained from catch analysis",
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                    "content": "and egg and larval, aerial, and acoustic surveys.",
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                    "content": "and Dr. Reuben Lasker of the La Jolla Laboratory have worked out a",
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                    "content": "technique which can be used to determine the age of larval and",
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                    "content": "juvenile anchovies very precisely. Mr. David Kramer, Fishery Bio-",
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                    "content": "logist at the La Jolla Laboratory, is presently working with Dr.",
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                    "content": "Mathews to learn the technique and plans to apply it to establish",
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                    "content": "the dates of birth of individuals from incoming year classes of fish.",
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                    "content": "The technique will provide information on whether survival of anchovy",
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                    "content": "larvae occurs in restricted time periods or whether it is spread out",
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                    "content": "evenly over the entire spawning period. Eventually, the information",
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                    "content": "might be correlated with the earlier appearance and disappearance",
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                    "content": "of suitable food for the larvae and the appearance of their predators",
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                    "content": "in the spawning areas.",
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                    "content": "Techniques Under Development to Study Structure of",
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                    "content": "Food Patches for Larval Anchovy in the Sea",
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                    "content": "Dr. R. Owen, Oceanographer at the La Jolla Laboratory, completed",
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                    "content": "laboratory tests of underwater television to detect microdistri-",
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                    "content": "bution of plankton organisms. Dark-field lighting proved to be",
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                    "content": "the most effective - individual organisms as small as 200 microns",
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                    "content": "could be tracked individually on the monitor screen, and \"clouds\"",
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                    "content": "of phytoplankters as small as 20 microns could be seen clearly using",
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                    "content": "istic movements of individuals can be used to identify the type of",
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                    "content": "be duplicated at sea by careful rigging of the camera, backdrop,",
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                    "content": "and light source for lowering or towing slowly to examine small-",
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                    "content": "Dr. Owen has also completed construction and dry testing of",
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                },
                {
                    "content": "the microgradient sampler (which obtains water samples at 20 cm",
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                    "content": "intervals vertically) as reported in previous monthly reports.",
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                {
                    "content": "Plans were made for testing the device at sea in July and for",
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                },
                {
                    "content": "measuring vertical gradients of concentrations of phytoplankton,",
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                },
                {
                    "content": "particles, nutrients and plant pigments over vertical distances",
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                {
                    "content": "of 200 cm. Variations of these gradients can be used to describe",
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                    "content": "microdistribution and to calculate vertical fluxes given in",
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                    "content": "addition to measurements of current shear and density gradients.",
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                    "content": "Plant pigment samples from current CalCOFI cruises were analyzed",
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                {
                    "content": "during the month under Dr. Owen's direction by Technicians",
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                },
                {
                    "content": "Marcia Pollock and Dan Berry. The samples will be used to convert",
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                {
                    "content": "in vivo fluorescence records from southern California Bight pump",
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                },
                {
                    "content": "stations to chlorophyll a values for the assessment of food rations",
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                    "content": "available to fish larvae.",
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                    "content": "Studies Continue on Invertebrate Predators",
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                    "content": "of Anchovy Larvae",
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                    "content": "Dr. Angeles Alvarino, Fishery Biologist at the La Jolla Laboratory,",
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                    "content": "continued her studies on the invertebrate predators of anchovy",
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                    "content": "larvae. Analyses of plankton samples of CalCOFI Cruise 5601 have",
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                    "content": "been completed and Cruise 5602 is now being examined. From these",
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                    "content": "Chaetognatha, Siphonophorae, Chonrdrophorae and Ctenophora, together",
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                    "content": "with information on other zooplankters present in the collections.",
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                    "content": "The number of specimens of Chaetognatha for each of the species",
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                    "content": "together with the size range of the individuals found at each stage",
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                    "content": "species",
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                },
                {
                    "content": "both",
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                {
                    "content": "series.",
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                },
                {
                    "content": "21",
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            ],
            "lines": [
                {
                    "content": "Dr. Alvariño found 11 species of Chaetognatha, 17 species of",
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                    ]
                },
                {
                    "content": "Siphonophorae, 9 species of Medusae, and one species of Ctenophora",
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                },
                {
                    "content": "in the 5601 samples. Pyrosomes were also abundant in the 5601",
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                    ]
                },
                {
                    "content": "material, with some samples containing more than 100 specimens",
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                },
                {
                    "content": "each at sizes ranging from 5 to 50 mm. Large salps, up to 150 mm",
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                },
                {
                    "content": "were also observed.",
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                    "spans": [
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                    ]
                },
                {
                    "content": "Guide to Scorpionfish Larvae in Final Stage",
                    "polygon": [
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                    "spans": [
                        {
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                    ]
                },
                {
                    "content": "\"A guide to the identification of Scorpionfish larvae (family",
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                    ]
                },
                {
                    "content": "Scorpaenidae) in the eastern Pacific with comparative notes on",
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                            "offset": 47691,
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                    ]
                },
                {
                    "content": "species of Sebastes and Helicolenus from other oceans\" is being",
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                    "spans": [
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                    ]
                },
                {
                    "content": "edited and the introductory section of the guide considerably",
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                    ]
                },
                {
                    "content": "enlarged by the author, Dr. G. Moser, Fishery Biologist at the",
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                },
                {
                    "content": "La Jolla Laboratory. Previous to preparation of the guide, complete",
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                    ]
                },
                {
                    "content": "life history series from newly-hatched larvae through the larval",
                    "polygon": [
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                    ]
                },
                {
                    "content": "and pelagic juvenile stage to the demersal juvenile stage were",
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                    "spans": [
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                            "offset": 48076,
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                        }
                    ]
                },
                {
                    "content": "available for Sebastes paucispinis (Moser, 1967), Sebastes",
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                    ]
                },
                {
                    "content": "macdonaldi (Moser, 1972) and the 2 eastern Pacific species of",
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                        }
                    ]
                },
                {
                    "content": "Sebastolobus (Moser, 1974). The guide will include 2 additional",
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                        }
                    ]
                },
                {
                    "content": "life history series for commercially important species of Sebastes",
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                        }
                    ]
                },
                {
                    "content": "off California - S. jordani and S. levis, 3 series of Sebastes from",
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                    ]
                },
                {
                    "content": "the Gulf of California including S. cortezi, 3 series of Sebastes",
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                            "offset": 48459,
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                    ]
                },
                {
                    "content": "from the North Atlantic - S. marinus, S. viviparous and S. fasciatus,",
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                    ]
                },
                {
                    "content": "2 series each for Pontinus and Scorpaena and 1 series each for",
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                    ]
                },
                {
                    "content": "Scorpaenodes, Helicolenus and Ectreposebastes.",
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                    ]
                },
                {
                    "content": "Dr. Moser has found that larvae obtained from full-term female",
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                    ]
                },
                {
                    "content": "Sebastes have already developed distinctive tail pigment but had",
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                    ]
                },
                {
                    "content": "not as yet developed the pigment pattern on the head, pectoral",
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                    ]
                },
                {
                    "content": "fins or larvae jaw, that they will have as early stage pelagic",
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                },
                {
                    "content": "larvae. Even so, the tail pigment can be very useful in distin-",
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                },
                {
                    "content": "guishing among Sebastes larvae. The tail pigment is arranged",
                    "polygon": [
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                            "offset": 49023,
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                    ]
                },
                {
                    "content": "in a series of melanophores along the ventral midline in all",
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                    ]
                },
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                    "content": "species of Sebastes and in over one-third of the species in a",
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                    ]
                },
                {
                    "content": "dorsal midline series of melanophores as well. Information on",
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                    ]
                },
                {
                    "content": "midline melanophores on the tail pattern of the body is included",
                    "polygon": [
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                    ]
                },
                {
                    "content": "for full-term larvae of species of Sebastes from the eastern North",
                    "polygon": [
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                    ]
                },
                {
                    "content": "Pacific. The average number of melanophores in the ventral midline",
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                    ]
                },
                {
                    "content": "series in species that had the dorsal series of melanophores range",
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                },
                {
                    "content": "from 8 (S. melanostomus and S. macdonaldi) to 22 (S. umbrosus).",
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                },
                {
                    "content": "In",
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                            "length": 2
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                    ]
                },
                {
                    "content": "species that have both dorsal and ventral midline pigments, the",
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                    ]
                },
                {
                    "content": "ventral count is usually much higher than for species having the",
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                },
                {
                    "content": "dorsal row exceeding 40 melanophores in over half of the species",
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                    ]
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                    "content": "larvae by Dr. E. Ahlstrom, Senior Scientist at the La Jolla Lab-",
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                    "content": "oratory. Two genera and six species will be included in the atlas",
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                    "content": "as follows: Citharichthys spp., Pleuronichthys spp., Citharichthys",
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                    "content": "stigmaeus, Paralichthys californicus, Lyopsetta exilis, Parophrys",
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                    "content": "vetulus, Microstomus pacificus, and Glyptocephalus zachirus. The 6",
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                    "content": "covered in the atlas. The distribution records were compiled by",
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                    "content": "Dr. E. Ahlstrom, and Biological Technician Elaine Sandknop who",
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                {
                    "content": "verified several dozen records that were questionable, a necessary",
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                    "content": "quality control procedure. About half of these proved to be valid",
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                {
                    "content": "records, the other half were misidentifications. The atlas will",
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                    "content": "give monthly distributions for the several flatfish that are taken",
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                    "content": "most commonly in CalCOFI collections, and for less common forms,",
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                    "content": "distribution will be compiled by quarters, or by 4-month groupings.",
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                    "content": "The atlas will follow the procedure established for CalCOFI Atlas #17,",
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                    "content": "which provided information on 6 common mesopelagic species, including",
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                    "content": "illustrations for each species and a brief description of its distinc-",
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                    "content": "tive larval features. The distribution charts which have already",
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                    "content": "been roughed out by the Scripps Institution of Oceanography are ready",
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                    "content": "for preparing in final form. Mr. John Wylie of Scripps is super-",
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                    "content": "vising the preparation of the distribution charts.",
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                    "content": "It has often been pointed out that 12 kinds of larvae (10 species,",
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                    "content": "2 genera) contribute about 90% of the larvae taken on CalCOFI cruises.",
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                    "content": "With the completion of this atlas, distribution charts of 11 of these",
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                    "content": "12 kinds will have been covered in CalCOFI atlases. Only rockfish",
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                    "content": "larvae, Sebastes spp., have yet to be covered in CalCOFI atlases.",
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                    "content": "Study to Examine Usefulness of Mathematical Technique",
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                    "content": "for Analysis of Catch per Unit Effort Data",
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                    "content": "Mr. J. Zweifel, Mathematician and Dr. Paul Smith, Fishery Biologist",
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                    "content": "TUNA ASSESSMENT AND DEVELOPMENT INVESTIGATIONS",
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                    "content": "Threadfin Shad Tested as Live Bait in Hawaii's",
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                    "content": "Skipjack Tuna Fishery",
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                    "content": "The Honolulu Laboratory and the Vocational Technology Department",
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                    "content": "skipjack tuna fishery. The initial plan is to take approxi-",
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                    "content": "weekly during the month of June. These fish are being made",
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                    "content": "water at the Honolulu Laboratory's Kewalo Basin Facility. The",
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                    "content": "thorough test as skipjack tuna live bait during the summer months.",
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                    "content": "have been small fish and even they are scarce. Ideally, shad",
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                    "content": "larger. Commercial fishing vessels, Easy Rider, Anela, Kilohana",
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                    "content": "Center",
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                    "content": "ENDEX",
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                    "content": "reports\" on the bonitos and the little tunas of the world. Two",
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                    "content": "Working Party on Development of Fisheries on Species of Small Tunas",
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                    "content": "Hawaii's \"Season\" Skipjack Tuna are Straggling",
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                    "content": "206.9 MT below the catch in June 1974 and 441.0 MT lower than the",
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                    "content": "months of 1975 is estimated at 1,165.6 MT, 461.8 MT below last",
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                    "content": "year's catch for the same period and 676.0 MT below the long-term",
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                    "content": "average.",
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                    "content": "System; Environmental Data Base Directory; Meteorological and Geo-",
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                    "content": "For descriptions of the data bases, information and/or demonstrations",
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                    "content": "of the ENDEX/OASIS system, those interested should contact Mr. Ross",
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                    "content": "at the Center (telephone number 453-2820, etc. 204).",
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                    "content": "PUBLIC RELATIONS - SOUTHWEST FISHERIES CENTER",
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                    "content": "June 18",
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                    "content": "Mr. Robert Nishimoto, Fishery Biologist, La Jolla",
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                    "content": "Laboratory, was host to Mr. William Fuselman and 20",
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                    "content": "students from Mt. Miguel High School in San Diego.",
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                    "content": "Mr. Nishimoto discussed albacore research and the",
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                    "content": "results of cooperative work with the American",
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                    "content": "Fishermen's Research Foundation.",
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                    "content": "June 26-29",
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                {
                    "content": "The first three panels of a six-panel permanent dis-",
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                {
                    "content": "play being prepared at the Honolulu Laboratory have",
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                    "content": "been completed and were exhibited at the Hawaii",
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                {
                    "content": "Outdoor Sports Show at the Ala Moana Shopping Center.",
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                    "content": "Honolulu Lagboratory, spoke to the staff on \"Growth",
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                    "content": "recapture data.\"",
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                    "content": "quick rundown on the Australian fisheries scene.",
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                    "content": "June 18",
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                    "content": "Marine Biology, spoke on \"Constraints of aquatic",
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            "content": "SOUTHWEST FISHERIES CENTER"
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            "content": "MONTHLY REPORT - JUNE 1975"
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            "content": "Silver Salmon Tagging Mortality Study Initiated 6"
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            "content": "Physiological Parameters Used to Describe Habitat Distribution of Tunas"
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            "content": "Progress Report on NMFS Porpoise Research in Preparation 10"
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            "content": "Study of Physiological Effects of Crude Oil Components in Life Stages of Fishes Being Terminated . . . 11"
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            "content": "Two-a-Day Weather Advisories to be Continued by SWFC and National Weather Service, Redwood City . 12"
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            "content": "Ocean Environment Related to Fishing Success in Eastern Tropical Pacific Tuna Fishery . 13"
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            "content": "U. S. - Mexico Plan Collaborative Research on Anchovies 14"
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            "content": "Joint Aerial and Acoustic Anchovy Surveys Planned 18"
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            "content": "Daily Ring Measurements in Larval and Juvenile Anchovies Can be Used to Determine Rate of Birth 19"
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            "content": "Techniques Under Development to Study Structure of Food Patches for Larval Anchovy in the Sea 19"
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            "content": "Guide to Scorpionfish Larvae in Final Stage . 21"
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            "content": "Threadfin Shad Tested as Live Bait in Hawaii's Skipjack Tuna Fishery"
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            "content": "S"
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            "content": "SOUTHWEST FISHERIES CENTER LA JOLLA, CALIFORNIA"
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            "content": "HONOLULU LABORATORY LA JOLLA LABORATORY TIBURON LABORATORY"
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            "content": "Struhsaker, Jeannette W., Wayne J. Baldwin and Garth I. Murphy. 1975. Environmental factors affecting stress and mortality of the Hawaiian anchovy in captivity. University of Hawaii, UNIHI-SEA GRANT-TR-75-02."
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            "content": "Nehu (Stolephorus purpureus) is the primary baitfish in the Hawaiian skipjack tuna fishery. The purpose of this study was to increase fishing efficiency by reducing baitfish mortality and time spent baiting."
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            "content": "The following biological and technicological factors were examined for their effect on nehu mortality: salinity, aeration, oxygen, temperature, current, light, tank color, recirculated reduced salinity, buffers, protein skimmer, density, food, disease, and predation. Time of bait capture (night or day) was also examined. A study of these factors and their effect on survival was made during capture and transfer to bait wells, in experimental laboratory tanks, in bait wells on an experimental barge, and in baitwells of commercial vessels while at sea. Results of these studies were applied in designing and testing improved live bait holding facilities."
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            "content": "The experiments demonstrated that reduced handling of nehu following capture plus modifications to the live bait wells will significantly reduce nehu mortalities and improve the efficiency of the fishery."
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            "content": "Approved by Center Director"
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            "content": "\"Ovarian development and fecundity of five species of California Current fishes\" by John S. MacGregor. For publication in California Cooperative Oceanic Fisheries Investigations Reports."
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            "content": "\"The development and use of sonar mapping for pelagic stock assessment in the California Current area\" by Roger P. Hewitt, Paul E. Smith and John C. Brown. For publication in the Fishery Bulletin, U.S."
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            ],
            "content": "\"Pre- and post-hatch growth of fishes - A general model\" by James R. Zweifel and Reuben Lasker. For publication in the Fishery Bulletin, U.S."
        },
        {
            "spans": [
                {
                    "offset": 7137,
                    "length": 215
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "\"Growth and reproduction of the spotted porpoise, Stenella attenuata, in the offshore eastern tropical Pacific\" by William F. Perrin, James M. Coe, and James R. Zweifel. For publication in the Fishery Bulletin, U.S."
        },
        {
            "spans": [
                {
                    "offset": 7353,
                    "length": 241
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "\"A uniform U.S. west coast logbook for albacore tuna, Thunnus alalunga (Bonneterre) and coastwide albacore fishery data system\" by R. Michael Laurs, Charles Hooker, Larry Hreha and Richard Lincoln. For publication in Marine Fisheries Review."
        },
        {
            "spans": [
                {
                    "offset": 7595,
                    "length": 180
                }
            ],
            "boundingRegions": [
                {
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                    ]
                }
            ],
            "content": "\"Sonar mapping in the California Current area: A review of recent developments\" by Roger Hewitt. For publication in California Cooperative Oceanic Fisheries Investigations Reports."
        },
        {
            "spans": [
                {
                    "offset": 7776,
                    "length": 175
                }
            ],
            "boundingRegions": [
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                    ]
                }
            ],
            "content": "\"Growth of laboratory-reared northern anchovy (Engraulis mordax) from southern California\" by Gary T. Sakagawa and Makoto Kimura. For publication in the Fishery Bulletin, U.S."
        },
        {
            "spans": [
                {
                    "offset": 7952,
                    "length": 183
                }
            ],
            "boundingRegions": [
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                    ]
                }
            ],
            "content": "\"Exploratory shrimp trawling in the Hawaiian Islands\" by Paul Struhsaker and Howard 0. Yoshida. For publication in the U.S. National Marine Fisheries Service, Marine Fisheries Review."
        },
        {
            "spans": [
                {
                    "offset": 8136,
                    "length": 1
                }
            ],
            "boundingRegions": [
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            ],
            "content": "2"
        },
        {
            "spans": [
                {
                    "offset": 8138,
                    "length": 33
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "ALBACORE FISHERIES INVESTIGATIONS"
        },
        {
            "spans": [
                {
                    "offset": 8172,
                    "length": 138
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "NMFS Scientists on NOAA Research Vessel, Cromwell Investigate Offshore Distribution of Albacore Tuna in Relation to Oceanographic Features"
        },
        {
            "spans": [
                {
                    "offset": 8311,
                    "length": 457
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 7,
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                }
            ],
            "content": "The recently reactivated NOAA research vessel, Townsend Cromwell, departed Seattle, Washington on June 19 on a survey to examine the offshore distribution of albacore tuna in relation to oceanographic features during the period of onshore migration. (The objective and background of this cruise were reported in the SWFC Monthly Report for April.) Mr. Ron Lynn, Oceanographer at the La Jolla Laboratory, was the head of the scientific party on the Cromwell."
        },
        {
            "spans": [
                {
                    "offset": 8769,
                    "length": 658
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "Salinity-temperature-depth (STD) hydrographic stations to 1,000 m were taken along most of the cruise track between the Straits of Juan de Fuca and Honolulu. A transect between 40° and 30º N along 137°30' W, which had been taken in the three previous years was repeated. Along this transect the subtropic front was found at 32º10' N -- a similar position to previous years. However, the subarctic front was near 39º30' N, 100 miles further north than in 1972 and 1973. The average depth of the 33.8º/o. isohaline which falls in the halocline of the subarctic was 150 m compared to 200 m for the earlier years; thus the front did not extend as deep this year."
        },
        {
            "spans": [
                {
                    "offset": 9428,
                    "length": 458
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 7,
                    "polygon": [
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                }
            ],
            "content": "In 1974 the subarctic front was diffuse and a remnant was found at 36°30' N. Although it is not warranted to make a definitive conclusion based on a single annual transect of these ocean features, it appears that the Transition Zone is half again as broad as in 1972 and 1973, and the northern boundary of the subarctic front not as strongly develop- ed. A situation somewhat similar to last year prevailed again this year. These conclusions are preliminary."
        },
        {
            "spans": [
                {
                    "offset": 9887,
                    "length": 673
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 7,
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                }
            ],
            "content": "Jig \"trolling\" using 10 lines was started when the Cromwell first en- countered sea surface temperatures in excess of 58ºF at 42°15' N, 134°07' W; the first albacore were taken within an hour. Trolling was conducted along the entire 137°30' W transect (between 40° and 30º N). The ship lay-to during hours of darkness. In all, 113 albacore were caught, 93 north of 35º N and 20 to the south. The largest number caught in one day was 48 at 38°30' N, 137°30' W. Fork lengths were measured on all fish and muscle samples, intestines and heads were collected for research projects underway involving analysis of tissue, trace metals, and otoliths. Nine neuston tows were taken."
        },
        {
            "spans": [
                {
                    "offset": 10561,
                    "length": 1
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            ],
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            "content": "3"
        },
        {
            "spans": [
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                    "length": 340
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 8,
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                }
            ],
            "content": "Radio contact was maintained with the three fishing vessels on charter to the American Fishermen's Research Foundation (AFRF) (a fourth vessel cancelled out of the joint research because of mechanical difficulties) when possible, and daily fishing reports were sent in by radio to the La Jolla Laboratory and AFRF through radio station WHG."
        },
        {
            "spans": [
                {
                    "offset": 10904,
                    "length": 179
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 8,
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                }
            ],
            "content": "Sixty-three STD stations were taken before mechanical problems with the vessel forced cancellation of the remaining eight stations; XBT casts were taken in place of the STD casts."
        },
        {
            "spans": [
                {
                    "offset": 11084,
                    "length": 90
                }
            ],
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            ],
            "content": "American Fishermen's Research Foundation Charter Vessels Complete Offshore Albacore Survey"
        },
        {
            "spans": [
                {
                    "offset": 11175,
                    "length": 599
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "As part of the NMFS-AFRF cooperative albacore research studies, three jigboats and one baitboat on charter to AFRF departed San Diego on June 1 and June 5, respectively, to conduct exploratory albacore fishing and to tag albacore in the early-season offshore fishery. The first albacore was caught by these boats on June 2 about 125 miles west-southwest of San Diego; however, no particular concentra- tions of fish were found. On June 7 the baitboat caught 50 fish (36 on jigs and 14 on bait) west of Guadalupe. One of the jigboats developed mechanical problems and headed for San Diego on June 12."
        },
        {
            "spans": [
                {
                    "offset": 11775,
                    "length": 445
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            ],
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                }
            ],
            "content": "Although the boats took some fish on most days their catches did not exceed 17 fish per day (except for the one day mentioned), until they reached 38º N in the offshore area during the last week of June. At that point their scores occasionally exceeded 100 fish per day. On june 29 the boats separated, one worked toward Astoria, Oregon and the others worked toward San Diego, each arriving in port near the beginning of the second week in July."
        },
        {
            "spans": [
                {
                    "offset": 12221,
                    "length": 609
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            ],
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                }
            ],
            "content": "The albacore were found scattered over a very broad region; some had moved close to southern California at an early date and a modest number were found much further north than in previous surveys. The ocean characteristics that likely influenced this distribution were the warmer-than-average temperatures in the offshore region, the broad spread of Transition Zone waters and the modest development of the subarctic front. The concentrating effect of the Transition Zone and the boundary fronts upon the albacore was more effective in 1972 and 1973 when the Zone was more narrow and the fronts were stronger."
        },
        {
            "spans": [
                {
                    "offset": 12831,
                    "length": 1
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            ],
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            ],
            "content": "4"
        },
        {
            "spans": [
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                    "offset": 12833,
                    "length": 39
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            ],
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                }
            ],
            "content": "COASTAL FISH COMMUNITIES INVESTIGATIONS"
        },
        {
            "spans": [
                {
                    "offset": 12873,
                    "length": 73
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 9,
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                }
            ],
            "content": "Analysis of Feeding Habits of Fishes Foraging over Sand Bottoms Continues"
        },
        {
            "spans": [
                {
                    "offset": 12947,
                    "length": 285
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "This month the investigators studying nearshore fish communities at the Tiburon Laboratory, Dr. Edmund Hobson, Project Leader, and Fishery Biologist, Tony Chess, continued analyzing the feeding relationships of fishes that forage over the open sand bottom adjacent to the kelp forests."
        },
        {
            "spans": [
                {
                    "offset": 13233,
                    "length": 414
                }
            ],
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            ],
            "content": "The work has involved assessing the organisms living in the sand that are prey of fishes, as sampled with a coring device. These organisms include polychaetes, mollusks, ostracods, cumaceans, amphipods, and mysids, all of which are being identified to species were feasible. Close attention has been paid to the movements many of these organisms make into the water column at night, as sampled with a plankton net."
        },
        {
            "spans": [
                {
                    "offset": 13648,
                    "length": 584
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "The feeding habits of the fishes that forage on and above the sand, most of them important recreational species, are being related to these prey occurrences and movements. Fishes under study that live on the sand day and night include the California halibut, Paralichthys californicus, the C-O Turbot, Pleuronichthys coenosus, and the speckled sand dab, Citharichthys stigmaeus. Fishes under study that forage over the sand at night after passing the day sheltered in the forest include the shiner surfperch Cymatogaster aggregata and the walleye . surfperch, Hyperprosopon argenteum."
        },
        {
            "spans": [
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                    "offset": 14233,
                    "length": 32
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            ],
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            ],
            "content": "COASTAL FISHERIES INVESTIGATIONS"
        },
        {
            "spans": [
                {
                    "offset": 14266,
                    "length": 35
                }
            ],
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                }
            ],
            "content": "Vessel Continues to Catch Red Crabs"
        },
        {
            "spans": [
                {
                    "offset": 14302,
                    "length": 340
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "The commercial fishing vessel Lady Olga returned to port in San Pedro with 76,000 1bs of pelagic red crabs, caught in international waters off Baja, California. Fishery Biologist Susumu Kato of the Tiburon Laboratory reports that this was the vessel's best trip; it took only eight fishing days to catch, as well as grind and bag the crabs."
        },
        {
            "spans": [
                {
                    "offset": 14643,
                    "length": 1
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 9,
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            ],
            "content": "5"
        },
        {
            "spans": [
                {
                    "offset": 14645,
                    "length": 478
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 10,
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                }
            ],
            "content": "The vessel left again in mid-June for its last trip prior to the albacore season. As before, the catch was sold to salmon growers in the Northwest. The Tiburon Laboratory was instrumental in getting this fishery started. Researchers at the Northwest Fish- eries Center and Pacific Fishery Products Technology Laboratory developed the primary market in the new and fast-growing salmon pen rearing industry. The Southwest Regional Office has also played a vital role in logistics."
        },
        {
            "spans": [
                {
                    "offset": 15124,
                    "length": 47
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 10,
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            ],
            "content": "Silver Salmon Tagging Mortality Study Initiated"
        },
        {
            "spans": [
                {
                    "offset": 15172,
                    "length": 945
                }
            ],
            "boundingRegions": [
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                    "pageNumber": 10,
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                }
            ],
            "content": "The Salmon Rearing and Release Task is a cooperative program involv- ing the Tiburon Laboratory, Sea Grant, California Department of Fish and Game, the Tyee Club, a sportfishermen's organization. The objec- tive is to rear salmon in salt water pens for release into San Francisco Bay to supplement the recreational fishery catch. Task Leader Susumu Kato, and Biological Technician Lloyd Richards of the Tiburon Laboratory, report that a tagging study was initiated this month to compare rates of shedding and early tag-related mortality between fish tagged with Carlin and anchor tags. The efficacy of two levels of antibiotics was incorporated into the study to earn effects of treatment on survival rate. Robert Rawstron of the California Department of Fish and Game aided by demonstrating efficient tagging procedures. Seventeen days after tagging, six fish (8%) have died including two controls and two each of Carlin and anchor tagged fish."
        },
        {
            "spans": [
                {
                    "offset": 16118,
                    "length": 307
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "Feeding studies are being conducted in an effort to induce silver salmon to feed on cheaper dry pellets. The fish are presently on a ration of 60% moist pellets mixed with 40% dry pellets, with no appreciable decline in feed uptake. The percentage of dry food will gradually be increased, hopefully to 100%."
        },
        {
            "spans": [
                {
                    "offset": 16426,
                    "length": 268
                }
            ],
            "boundingRegions": [
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                }
            ],
            "content": "Volunteer student Stanley Smith has isolated and cultured a disease organism tentatively identified as Vibrio. Further studies will be done to obtain positive identification of the bacteria. Vibriosis is the disease which is of greatest concern to most salmon growers."
        },
        {
            "spans": [
                {
                    "offset": 16695,
                    "length": 383
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            ],
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            ],
            "content": "Work continues on preparing the Pacific Anglers' Guide for publication. The Guide, co-authored by Jim Squire, Fishery Biologist at La Jolla, and Susan Smith, Publications Specialist at Tiburon, describes marine game fish fishing grounds and angler facilities all along the U.S. West Coast from California to Alaska, and around the tropical islands of Hawaii, American Samoa and Guam."
        },
        {
            "spans": [
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                    "offset": 17079,
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            "content": "6"
        },
        {
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            "content": "During the month, Ms. Smith travelled to Rockville, Maryland, to meet with cartographer Jim Goodlin, (NOAA Visual Services), who is preparing the Guide's 40 coastal fishing charts. They discussed various ways of presenting the fishing information on the base maps, and made final decisions on the layout of each fishing chart. An effort is being made to make the charts not only readable, well organized and attractive but also relatively inexpensive to print -- hopefully passing on the savings to the public when the book be- comes available through GPO. The authors plan to have the Guide ready for the printers in late fall."
        },
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            "content": "FISH ENVIRONMENTAL INVESTIGATIONS"
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            "content": "Physiological Parameters Are Used to Describe Habitat Distribution of Tunas"
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            "content": "Using three physiological parameters, Oceanographer Dr. Richard Barkley has succeeded in explaining many of the features of the geographical distribution of skipjack tuna and some aspects of their vertical distribution. Parameters used include the ultimate lower lethal temperature, an upper lethal temperature of 35º C obtained by adding the temperature of the water to the excess body temperature, and oxygen levels at or slightly below 5 ppm. All three values were empirically determined with captive tuna at Honolulu Laboratory's Kewalo Basin Facility."
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            "content": "Since this approach proved so fruitful with skipjack tuna, and for comparative purposes, the Experimental Ecology of Tunas group under Dr. Andrew Dizon, Fishery Biologist at the Honolulu Laboratory, is expanding its observations using yellowfin tuna while modifying procedures to conserve supplies of hard-to-obtain yellowfin tuna. Fish are tested for 2 days in the behavioral thermoregulation tank with low oxygen levels and/or gradients and then used to determine excess body temperatures and coefficients of heating and cooling for different tissues."
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            "content": "Messrs. Randolph Chang and Minato Yasui, the latter a graduate student from Takai University, have tested five yellowfin tuna. Data have been analyzed to determine excess temperatures and k coefficients for four. Results indicate that for both parameters, yellowfin do not differ significantly from skipjack tuna."
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            "content": "7"
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            "content": "Prior to testing for k's and excess temperatures, fish behavior is examined under stable low oxygen conditions and slowly decreasing oxygen levels starting at saturation. Skipjack tuna are also tested in order to have a measure with which to compare the behavior of the yellowfin tuna. Fourteen skipjack tuna and four yellowfin tuna have been tested. Although the supply of yellowfin tuna is too small to do a credible low oxygen resistance study, one can get an idea of the relative abilities of yellowfin tuna to withstand oxygen stress when their performance is compared with skipjack tuna and speckled trout. Consider the following observations and numbers: Yellowfin tuna demonstrated no change in behavior during periods of decreasing (to 1.55 ppm) and then increasing oxygen levels lasting approximately 300 min; skipjack tuna in contrast dramatically increase swim speed as oxygen drops 4 ppm and never survive the recovery. Showing no visible signs of stress or alterations from basal swim speeds, tested yellowfin tuna survived 200 min at 1.4 ppm and 200 min at 1.6 ppm. These two fish were 46.7 and 50.6 cm, respectively, and swam remark- ably precise laps at 1.5 lengths/sec. Skipjack tuna cannot survive these levels very long. Death occurred in 42 min at 1.7 ppm; 20 min at 1.4 ppm; and 47 min at 2.6 ppm. Swimming speeds of skipjack tuna increase up to about 3.5 lengths/sec at oxygen levels below 4 ppm. Literature values for speckled trout LDFare 100 min at 1.4 ppm when forced to swim at 1.5 lengths/sec. It seems from these preliminary data that yellowfin tuna has ability to withstand low oxygen stress that is comparable to other nonscombrid fish. If supplies of yellow- fin become more plentiful, Dr. Dizon will measure routine respiration rates and do a proper resistance study."
        },
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            "content": "FEI Chief Dr. Richard Barkley completed a manuscript entitled \"Hypo- thetical habitat of skipjack tuna based on temperature and oxygen requirements.\" Internal review has been completed and the draft is being revised."
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            "content": "Instrument Designed to Facilitate Heat Transfer; May Lessen Tuna \"Burn\""
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            "content": "Honolulu Laboratory Fishery Biologist Heeny Yuen is chief investiga- tor into a phenomenon described as fish \"burn\", a discoloration of the flesh occurring in yellowfin and bigeye tunas taken by trolling and handline off the island of Hawaii."
        },
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            "content": "8"
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            "content": "Hypothesizing that the condition is caused by heat denaturation of body protein as a fish struggles on the hook, Mr. Yuen has designed a \"heat transfer facilitator.\" It is hoped that this simple instrument, now ready for \"ease-of-handling\" tests, may expedite the transfer of the fish's body heat away from the tissues."
        },
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            "content": "* * *"
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            ],
            "content": "Research Assistant Randolph Chang at the Honolulu Laboratory is preparing a paper on the effects of low oxygen as a barrier to voluntary movements of tunas for presentation at the coming Tuna Conference at Lake Arrowhead."
        },
        {
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            "content": "MARINE MAMMALS"
        },
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            "content": "NOAA General Counsel Reviews Application of Freedom of Information Act to NMFS Porpoise Data"
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            ],
            "content": "Mr. John Milholland, General Counsel, NOAA, visited the South- west Fisheries Center, June 9 to 12, to carry out legal research on the application of the Freedom of Information Act to various kinds of porpoise data and records. He consulted with scientists and observers of the tuna-porpoise program, studied a cross- section of data files, and met on the morning of June 12 with Messrs. August Felando of the American Tunaboat Association, and Frank Alverson, Living Marine Resources, Inc., as well as Center personnel for the purpose of gaining a better understanding of the commercial significance of certain kinds of data. He also had an opportunity to discuss the problem with Mr. Harold Medina, a tunaboat captain, and other industry representatives at an industry meeting with NMFS Director Robert Schoning on June 10 in San Diego."
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            "content": "Mr. Raymond Hubley, Chief, Endangered Species and Marine Mammal Coordinator, was at the Center on June 9 and met with Center personnel and Southwest Region Director, Gerald V. Howard, in a detailed examination of factors to be considered in making a transition from a research-mode porpoise observer program to one which will collect management information as well."
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            "content": "9"
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            "content": "Progress Report on NMFS Porpoise Research in Preparation"
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            "content": "Principal effort of biologists, marine mammalogists, and popu- lation dynamics specialists involved in the Porpoise/Tuna program at the La Jolla Laboratory, under the leadership of Dr. William Lenarz, has been devoted for the past 2 months to the preparation of a progress report on the results of NMFS porpoise research for the 1975 Fiscal Year. The report will include estimates of porpoise mortality, life histories of the principal porpoise species involved in the tropical tuna fishery in the eastern Pacific, population estimates of spotted and spinner dolphins, and an evaluation of data compiled by the porpoise observers who accompanied U.S. tuna seiners. The report is scheduled to be completed in August and the National Marine Fisheries Service in Washington, D.C. plans to release it to the public later that month."
        },
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            "content": "Recent Developments in Porpoise/Tuna Research"
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            "content": "As of June 30, only three NMFS observers remained at sea. Thus far during the 1975 tuna fishing season, 28 trips have been completed by NMFS porpoise observers on tuna vessels of the U.S. fleet."
        },
        {
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            "content": "Another tuna seiner is due to leave port during July with a NMFS gear research technician aboard. The ship will carry a porpoise apron, current indicator ribbons, and prototypes of the \"porpoise grabber\" (a device to help guide porpoise out of the net). Final arrangements are also being completed to place the NMFS large- volume purse seine, current indicator ribbons, and porpoise grabber aboard another seiner, which will also carry a NMFS gear research technician to observe functioning of these porpoise-saving devices."
        },
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            "content": "On June 17, Dr. Eric Barham, Mr. David Holts of the La Jolla Laboratory, and Mr. Jerry Jurkovich of the Northwest Fisheries Center, participated in a required training workshop for tunaboat skippers, administered by the NMFS Southwest Region through the American Tunaboat Association. Mr. Jurkovich discussed the opera- tion of the porpoise apron, Dr. Barham talked about some preliminary results achieved by various tuna boats who have tried the device at sea under actual fishing conditions, and Mr. Holts discussed aspects of the biology of porpoises."
        },
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            "content": "10"
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            ],
            "content": "One of the research efforts of the Porpoise Stock Assessment Task is to review the dynamics of other exploited mammals, particularly cetaceans, to develop insights on the dynamics of porpoise stocks. As an outgrowth of this work, Fishery Biologist Tim Smith at the La Jolla Laboratory has completed a short manu- script on changes in population size of sei whales, in support of the U.S. efforts at the International Whaling Commission held in London during June 1975, entitled \"Calculation of apparent increases in the Antarctic sei whale population between 1930 and 1960.\" Dr. Smith concluded in this manuscript that if, as is suggested, the Antarctic sei whale population was increasing prior to initial exploitation in the early 1960's, then the con- cept of single species maximum sustainable yield is not necessarily immediately applicable to determining optimum harvesting levels. In particular, there is no meaningful equilibrium population size as a known reference point. The other species of baleen whales in the Antarctic might have to be considered before any sort of equilibrium can be defined, but the population dynamics tools needed for multi-species exploitation need to be developed."
        },
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            "content": "PHYSIOLOGY INVESTIGATIONS"
        },
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            ],
            "content": "Study of Physiological Effects of Crude Oil Components on Life Stages of Fishes being Terminated"
        },
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            ],
            "content": "Dr. Jeannette Struhsaker, Chief, Physiology Investigations and her staff have been working to complete manuscripts on the physio- logical effects of mono-aromatics in crude oil on fish. This program will terminate at the end of FY-75, June 30."
        },
        {
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            ],
            "content": "Sid Korn, Fishery Biologist, sent tissue samples from Pacific herring to be analyzed for phenol content. Phenol is probably the major metabolite produced from benzene metabolism in fish."
        },
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            ],
            "content": "Dr. Struhsaker announced that initial planning is in progress for the study of striped bass egg embryo and larval stages; work will begin in FY-76 on mortality factors during these stages."
        },
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            ],
            "content": "Pete Benville, Chemist, initiated monitoring studies required by the Environmental Protection Agency (EPA) for sewer discharge for the sea water system discharge. Influent and effluent discharges from both the sea water system and sewer plant have been analyzed for the components specified by new EPA standards."
        },
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            "content": "STOCK ASSESSMENT AND FISHERY EVALUATION INVESTIGATIONS"
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                    "polygon": [
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            ],
            "content": "Two-a-Day Weather Advisories to be Continued by SWFC, La Jolla and NWS, Redwood City"
        },
        {
            "spans": [
                {
                    "offset": 28062,
                    "length": 608
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                }
            ],
            "content": "In the May Monthly Report it was announced that SWFC would broad- cast, on a trial basis, a \"Wind and Weather Analysis and Advisory Chart\" in the morning at 1400 GMT (0700 PDT). After the trial period, (June 9 to 13), the favorable responses received from tuna fishermen indicated that the early morning chart was a useful service. It will, therefore, be continued indefinitely. The major advantage of the new chart is that it incorporates more recent information concerning the formation and movement of storms in the tropical Pacific. This is particularly valuable information during the \"chubasco\" season."
        },
        {
            "spans": [
                {
                    "offset": 28671,
                    "length": 500
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            ],
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                }
            ],
            "content": "The skipjack tuna stock of the Atlantic ocean has long been con- sidered an underexploited resource, but fisheries for this species are developing rapidly. Fishery Biologist T. Murphy at the La Jolla Laboratory is compiling data for a paper that will review the history of the skipjack fisheries and attempt to evaluate the status of the present Atlantic stock. This work is part of the La Jolla Labora- tory's effort in preparation for the 1975 ICCAT meeting to be held in November in Madrid, Spain."
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        {
            "spans": [
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                }
            ],
            "content": "Tuna Vessel Participation in Radio Weather Reporting Program Remains High"
        },
        {
            "spans": [
                {
                    "offset": 29246,
                    "length": 204
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "The number of weather and XBT observations received by radio station wwd, La Jolla, continues to exceed the reporting rate of last year. During June a total of 34 U.S. purse seiners reported observations."
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        {
            "spans": [
                {
                    "offset": 29451,
                    "length": 2
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            ],
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            "content": "12"
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                    "length": 19
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            "content": "June Reporting Rate"
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            ],
            "content": "Weather Observations"
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            "content": "XBT Observations"
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                    "length": 5
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            "content": "Total"
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                    "length": 4
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                    "pageNumber": 17,
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            "content": "1974"
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            "content": "152"
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            "content": "36"
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                    "length": 3
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            ],
            "content": "188"
        },
        {
            "spans": [
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                    "length": 4
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            "boundingRegions": [
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            "content": "1975"
        },
        {
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            "boundingRegions": [
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            ],
            "content": "222"
        },
        {
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            "boundingRegions": [
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            ],
            "content": "63"
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        {
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                    "length": 3
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            "boundingRegions": [
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            ],
            "content": "285"
        },
        {
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                    "length": 7
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                }
            ],
            "content": "Percent"
        },
        {
            "spans": [
                {
                    "offset": 29558,
                    "length": 4
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            ],
            "boundingRegions": [
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                }
            ],
            "content": "+75%"
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        {
            "spans": [
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                    "offset": 29563,
                    "length": 4
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            "boundingRegions": [
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            "content": "+52%"
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        {
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            ],
            "content": "change"
        },
        {
            "spans": [
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                    "offset": 29575,
                    "length": 4
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            "boundingRegions": [
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            "content": "+46%"
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        {
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            "content": "January - June"
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            ],
            "content": "Weather Observations"
        },
        {
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                    "length": 16
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            "content": "XBT Observations"
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            ],
            "content": "Total"
        },
        {
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                    "length": 4
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            "content": "1974"
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        {
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            "content": "1306"
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        {
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            "content": "204"
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            "content": "1510"
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            "content": "1611"
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            "content": "350"
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            "content": "1961"
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            "content": "Percent"
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            "content": "change"
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            "content": "+23%"
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            "content": "+30%"
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            ],
            "content": "Ocean Environment Related to Fishing Success in Eastern Tropical Pacific Tuna Fishery"
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            "spans": [
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            ],
            "content": "During the past year, scientists from NMFS, La Jolla Laboratory, and the Inter-American Tropical Tuna Commission, completed the first phase of a joint project to study possible relationships between success in purse seining for tropical tunas and the ocean properties monitored aboard tuna boats. A detailed statis- tical analysis has now been completed by Mr. Forrest Miller, IATTC, Mr. Dick Evans, Mr. K. Bliss, La Jolla Laboratory and Mr. C. Orange, IATTC, using approximately 2,000 surface and sub- surface (expendable bathythermograph) observations matched in time and location to purse seine sets. The environmental data included sea surface temperature (SST), mixed layer depth (MLD), temperature gradient in the thermocline (TGRAD), and windspeed (WSPD). These parameters were paired with catch data which included the catch-per- set, the type of set (porpoise set, school set, log set, night set), the species of tuna captured, and the type of set attempted when no fish were captured. For each vessel all the variables were averaged over 5° squares per month. After eliminating \"skunk sets\" the 127 data points remained for use in the statistical analyses."
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            "content": "13"
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            ],
            "content": "The statistical results re-confirmed earlier studies which note the importance of the thermocline depth (MLD) and temperature gradient in explaining catch success. Surface temperature (SST) alone did not provide a satisfactory explanation of catch per set. However, an examination of the data revealed that 86% of the successful sets on yellowfin were made in waters where SSTs were between 79º and 83.5º F. From season-to-season the area of the eastern tropical Pacific bounded by the 79º and 84º F isotherms fluctuates markedly. The annual distribution of yellowfin catch confirms that the areas most heavily fished correspond to the surface temperature regime between 79° and 84º F."
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            "content": "Some of the more revealing statistical results were multiple regression equations which used average catch-per-set as the dependent variable and SST, TGRAD, WSPD and MLD as independent variables. Initial analysis indicated that MLD might have a non- linear effect. Dummy variables were fitted to the equation until it was determined that the MLD had a critical value of 100 feet. Using this critical value on porpoise sets, the environmental para- meters combined to explain 22% of the variation in the catch."
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            "content": "Analogous results for the non-porpoise set were insignificant, probably due to the small number of observations. Although the proportion of variance explained by the linear regression equation was small, the highly significant F-statistics lend support to the hypothesis that environmental conditions which were monitored are important factors in the success of tuna seining. A more compre- hensive study of these relationships is underway based on the insights gained in this initial analysis."
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            "content": "STOCK RECRUITMENT INVESTIGATIONS"
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            "content": "U.S. - Mexico Plan Future Collaborative Research on Anchovies"
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            "content": "Dr. Reuben Lasker, Acting Chief of the Coastal Fisheries Division at the La Jolla Laboratory, represented NMFS at a joint meeting of the Instituto Nacional de Pesca-California Cooperative Oceanic Fisheries Investigations scientists at Cocoyoc, Mexico, June 26 and 27, to discuss areas of mutual interest and possible collabora- tion in the study of anchovies in the California Current area. As"
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            "content": "14"
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            "content": "a starting point, the establishment of the following three working groups was approved: a) status of the anchovy stocks, b) acoustic surveys, and c) egg and larval surveys."
        },
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            "content": "The participants agreed that the \"status of the stocks\" workshop will take place sometime in September and both sides are being asked to prepare documents such as a list and location of avail- able data; a full description of data collection, processing and display as well as a list of computer programs available for fishery statistics and a list and description of existing models on stock and recruitment, bio-economic and yield-per-recruit."
        },
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            "content": "Dr. Lasker proposed an agenda for the acoustics workshop that was agreed to, in principle, by all parties. The meeting day of the acoustics workshop will be on December 4 or 5, prior to the annual CalCOFI meeting in San Diego. The egg and larval survey working group will meet on December 16 and 17."
        },
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            "content": "Other types of collaborations discussed at this meeting included FAO Fellowships at the Southwest Fisheries Center and scientific consultation by La Jolla Laboratory scientists in Mexico."
        },
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            "content": "Experiments Begun to Evaluate Starvation as Cause of Mortality in Jack Mackerel Larvae"
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            "content": "Experiments were begun this month by Ms. Gail Theilacker, Fishery Biologist at the La Jolla Laboratory, to evaluate starvation as a cause of mortality in jack mackerel larvae. Jack mackerel eggs were collected aboard the David Starr Jordan, 200 miles off San Diego this month. The eggs were returned to the aquarium at the La Jolla Laboratory and the larvae reared at three temperatures, 14º C (range 14.0° to 14.2º C), 16° C (range 14.0° to 17.0° C), and 17º C (range 16.5° to 17.2º C), using a high density feeding regime. At 16° C a low density experiment was also included. The food organisms were Gymnodinium splendens (a dinoflagellate fed at 200/ml in all feeding trials), Brachionus plicatilis (a rotifer offered at 50 and 0.1/ml) and Tisbe furcata (a copepod fed at 4 and 0.002/ml). One group at each temperature was de- prived of food. Larvae were sampled daily for 2 weeks from each test group and preserved for histological studies."
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            "content": "At 14° and 16° C the larvae started feeding on day 7 (hatching = day 1) and the yolk and oil were absorbed by the 12th to 13th day at 14° C and by the 9th and 10th day at 16° C. Feeding commenced on day 6 at 17º C and the yolk and oil were absorbed by the 8th to 9th day."
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            "content": "15"
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            "content": "It was interesting that many larvae in the groups that were fed appeared to be starving. This was especially noted on the days of yolk and oil absorption. These larvae exhibited very slow swimming movements and/or the body cavity seemed to be bloated. These specimens were also preserved."
        },
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            "content": "Larvae survived for 3 weeks in the low density feeding experiment at 16° C and at 4 weeks a few are still alive in the high density group."
        },
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            "content": "Efforts Made to Replenish Spawning Stocks of Mackerel at La Jolla Laboratory"
        },
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            "content": "Mr. R. Leong, Fishery Biologist, reports that efforts are being made to capture new Pacific mackerel to replenish dwindling spawning stocks at the La Jolla Laboratory. These fish are usually found in the La Jolla kelp beds during the summer months and can be caught with hook and line. The fish being caught measure about 10 inches in total length and are too small to spawn, but should be mature by the spring of the coming year. Enough mature fish remain to fulfill any forseeable egg demands. A manuscript is being prepared to describe the maturation of mackerel under different light-temperature conditions in the laboratory."
        },
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            "content": "The end result of the report is the formulation of a scheme to have ripe fish in the laboratory throughout the year and spawn them on demand with gonadotropic agents. In nature, the Pacific mackerel spawns off the southern California coast only during May through August. It appears the temperature is far more important than the photoperiod in regulating maturation and a high temperature, 19º C or more, will accelerate egg development. However, prolonged ex- posure to high temperatures also has a debilitating effect and the state of health of the fish begins to decline in about 4 months with eventual death in about 6 months. The fish develop more slowly at 16° to 17º C but the mackerel remain healthier and a few are ripe the year around. The ripe fish can be detected through a biopsy technique and can then be spawned with a combination of hormone injections. The combination now being used is 1 mg of crude salmon pituitary followed 24 hours later with 100 units of pregnant mare serum."
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            "content": "Apparatus Designed for Predation Experiments on Eggs and Larval of Northern Anchovy"
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            "content": "Ms. Carol Sanchez, Biological Technician at the La Jolla Laboratory, spent a portion of last month in designing and con- structing an apparatus designed to evaluate various biological and physical variables involved in the predation by fish on eggs and larvae of the northern anchovy. Under construction are three, 10-foot diameter tanks which are manifolded together, each with 6-foot-long fiberglass troughs. This apparatus, when completed, will permit maintaining a stock tank of predators in one tank, stocks of larvae in another tank, and the movement of predators and larvae from their maintenance tank to a third tank by move- ment through the troughs and gates. The third tank will serve as a test tank where behavior and ingestion rates of the predators will be studied. Initial objectives of this work will be to determine, whether or not various fish predators, including anchovy, jack mackerel and Pacific mackerel, are capable of feeding on eggs and larvae of anchovys in significant quantities and the mode of feeding behavior used by the predator. Studies will also focus on the role of larval size, or stage of development and physical condition, (starved vs. unstarved larvae) and on the vulnerability to predator. Also, certain measurements will be taken to facilitate future field work such as determining the time a larva or egg can remain in the gut of a predator and still be identified, and in- direct methods for determining the length of ingested specimens."
        },
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            "content": "This month, Dr. Edward Scura, Physiologist at the La Jolla Laboratory, continued to investigate the causes of larval fish mortality in the Los Angeles Bight. Data collected on the CalCOFI cruises indicates that good feeding conditions prevailed for first-feeding anchovy larvae along the southern California coast this past winter. The predominant phytoplankton in the chlorophyll maximum was the dino- flagellate, Gonyaulax polyedra. This organism is the proper size for first-feeding anchovy (ca 50 um) but preliminary laboratory experiments indicate that larval growth and survival is reduced when G. polyedra is the only food available. Currently, larval anchovies are being reared on a diet of G. polyedra supplemented with various concentrations of copepod nauplii (Tisbe furcata) in an attempt to simulate conditions as they might exist in the environment."
        },
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            "content": "17"
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            "content": "Computer Runs of 25,000 CalCOFI Time Series of Sized Anchovy and Sardine Larvae Completed"
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            "content": "Computer runs of 25,000 CalCOFI time series (1951 to 1969) of sized larvae of northern anchovy and Pacific sardine were com- pleted this month by D. Roll, N. Wiley, R. Parrish and B. B. Burris of the Automated Data Processing unit at the La Jolla Laboratory. There are five computer runs which characterize each species. The first table contains larval counts standard- ized to number per 10 sq m for each station and primary regional data summaries by month, quarter and year. The primary data summaries contain the mean number of larvae per positive station and the point of positive stations. The second table contains parameter estimates for the normal, log-normal, binomial, and negative binomial distribution by region and quarter. Each arithmetic mean is here weighted to the area of the region. The third table contains only seasonally weighted total estimates of larvae by region. The fourth table contains the regional time series for all regions and the weighted totals for the entire survey area for each quarter. The fifth table contains the catch rate of each size by time of day."
        },
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            "content": "A second series of tables will be created which is corrected by current estimates of the known biases in the collection technique. The smaller sizes of larvae will be adjusted to compensate for the tendency for the larvae to be extruded or escape through the meshes of the net. The larger sizes of larvae will be adjusted to compensate for the tendency of larvae to be taken in fewer tows in the daytime and for the larvae to be taken in smaller numbers in daytime tows. All sizes will be adjusted to reflect differing growth rates at different temperatures. A document is now being prepared by Lt. Roger Hewitt, NOAA Corps officer at the La Jolla Laboratory, to outline these corrections to known biases. These adjusted runs will be available as a tape and a printed output by October. Speci- mens of recent data are also available for jack mackerel, Pacific mackerel, and Pacific hake."
        },
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            "content": "Joint Aerial and Acoustic Anchovy Surveys Planned"
        },
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            "content": "At a recent State/Federal anchovy workshop joint aerial and acoustic surveys were discussed and a cruise has been planned for August 1975, by James Squire, Fishery Biologist and Lt. Roger Hewitt, NOAA Corps on detail to the La Jolla Laboratory, to conduct such work. Recent discussions with Mr. David Cram of the Republic of South Africa have highlighted the difficulty of using echo integration for surface"
        },
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            "content": "18"
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            ],
            "content": "schooling fishes like the anchovy. The planned cruise on the NOAA research vessel, David Starr Jordan, will combine aerial observations with echo sounding, underwater photography, and sonar mapping. In- formation needed to manage fisheries for anchovies, sardines, mackerel and jack mackerel off South Africa is obtained from catch analysis and egg and larval, aerial, and acoustic surveys."
        },
        {
            "spans": [
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            "content": "Daily Ring Measurements in Larval and Juvenile Anchovies Can be Used to Determine Date of Birth"
        },
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            "content": "Dr. E. Brothers of the Inter-American Tropical Tuna Commission, Dr. Christopher Mathews of the Ciencias Marinas of Baja California, and Dr. Reuben Lasker of the La Jolla Laboratory have worked out a technique which can be used to determine the age of larval and juvenile anchovies very precisely. Mr. David Kramer, Fishery Bio- logist at the La Jolla Laboratory, is presently working with Dr. Mathews to learn the technique and plans to apply it to establish the dates of birth of individuals from incoming year classes of fish. The technique will provide information on whether survival of anchovy larvae occurs in restricted time periods or whether it is spread out evenly over the entire spawning period. Eventually, the information might be correlated with the earlier appearance and disappearance of suitable food for the larvae and the appearance of their predators in the spawning areas."
        },
        {
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            "content": "Techniques Under Development to Study Structure of Food Patches for Larval Anchovy in the Sea"
        },
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            "spans": [
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            "content": "Dr. R. Owen, Oceanographer at the La Jolla Laboratory, completed laboratory tests of underwater television to detect microdistri- bution of plankton organisms. Dark-field lighting proved to be the most effective - individual organisms as small as 200 microns could be tracked individually on the monitor screen, and \"clouds\" of phytoplankters as small as 20 microns could be seen clearly using a dark background and side lighting. Results suggest that character- istic movements of individuals can be used to identify the type of plankter even when the individual's image was not clearly resolved. Lighting conditions similar to those used in laboratory tests can be duplicated at sea by careful rigging of the camera, backdrop, and light source for lowering or towing slowly to examine small- scale changes in plankton concentration over small vertical or horizontal distances as a guide to further quantitative sampling by other methods."
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            "content": "Dr. Owen has also completed construction and dry testing of the microgradient sampler (which obtains water samples at 20 cm intervals vertically) as reported in previous monthly reports. Plans were made for testing the device at sea in July and for measuring vertical gradients of concentrations of phytoplankton, particles, nutrients and plant pigments over vertical distances of 200 cm. Variations of these gradients can be used to describe microdistribution and to calculate vertical fluxes given in addition to measurements of current shear and density gradients."
        },
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            "spans": [
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            "content": "Plant pigment samples from current CalCOFI cruises were analyzed during the month under Dr. Owen's direction by Technicians Marcia Pollock and Dan Berry. The samples will be used to convert in vivo fluorescence records from southern California Bight pump stations to chlorophyll a values for the assessment of food rations available to fish larvae."
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            "content": "Studies Continue on Invertebrate Predators of Anchovy Larvae"
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                    "length": 1182
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            "content": "Dr. Angeles Alvarino, Fishery Biologist at the La Jolla Laboratory, continued her studies on the invertebrate predators of anchovy larvae. Analyses of plankton samples of CalCOFI Cruise 5601 have been completed and Cruise 5602 is now being examined. From these studies, Dr. Alvariño determines the numerical abundance of Chaetognatha, Siphonophorae, Chonrdrophorae and Ctenophora, together with information on other zooplankters present in the collections. The number of specimens of Chaetognatha for each of the species present is determined as is the stage of maturity of each species, together with the size range of the individuals found at each stage of maturity. Siphonophorae abundance is determined for each repre- sentative at various stages of the life cycle, for each of the species observed. Information is also being obtained on the number of specimens per species of Medusae, Chrondrophorae, and Ctenophora, at the various stages of their life cycles and their respective size range. Counts are also made on the number of specimens with fish larvae in their digestive tracts, including identification of the predator and prey, and their sizes and stage of development."
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            "content": "20"
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            "content": "Dr. Alvariño found 11 species of Chaetognatha, 17 species of Siphonophorae, 9 species of Medusae, and one species of Ctenophora in the 5601 samples. Pyrosomes were also abundant in the 5601 material, with some samples containing more than 100 specimens each at sizes ranging from 5 to 50 mm. Large salps, up to 150 mm were also observed."
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            "content": "Guide to Scorpionfish Larvae in Final Stage"
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            "content": "\"A guide to the identification of Scorpionfish larvae (family Scorpaenidae) in the eastern Pacific with comparative notes on species of Sebastes and Helicolenus from other oceans\" is being edited and the introductory section of the guide considerably enlarged by the author, Dr. G. Moser, Fishery Biologist at the La Jolla Laboratory. Previous to preparation of the guide, complete life history series from newly-hatched larvae through the larval and pelagic juvenile stage to the demersal juvenile stage were available for Sebastes paucispinis (Moser, 1967), Sebastes macdonaldi (Moser, 1972) and the 2 eastern Pacific species of Sebastolobus (Moser, 1974). The guide will include 2 additional life history series for commercially important species of Sebastes off California - S. jordani and S. levis, 3 series of Sebastes from the Gulf of California including S. cortezi, 3 series of Sebastes from the North Atlantic - S. marinus, S. viviparous and S. fasciatus, 2 series each for Pontinus and Scorpaena and 1 series each for Scorpaenodes, Helicolenus and Ectreposebastes."
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            "content": "Dr. Moser has found that larvae obtained from full-term female Sebastes have already developed distinctive tail pigment but had not as yet developed the pigment pattern on the head, pectoral fins or larvae jaw, that they will have as early stage pelagic larvae. Even so, the tail pigment can be very useful in distin- guishing among Sebastes larvae. The tail pigment is arranged in a series of melanophores along the ventral midline in all species of Sebastes and in over one-third of the species in a dorsal midline series of melanophores as well. Information on midline melanophores on the tail pattern of the body is included for full-term larvae of species of Sebastes from the eastern North Pacific. The average number of melanophores in the ventral midline series in species that had the dorsal series of melanophores range from 8 (S. melanostomus and S. macdonaldi) to 22 (S. umbrosus). In species that have both dorsal and ventral midline pigments, the ventral count is usually much higher than for species having the dorsal row exceeding 40 melanophores in over half of the species having both series."
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            "content": "21"
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            ],
            "content": "Mr. David Misitano, Fishery Biologist at the Northwest Fisheries Center spent 3 weeks at the Center during June studying identi- fication of fish eggs and larvae with Dr. Ahlstrom and his staff."
        },
        {
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            "content": "CalCOFI Atlas Dealing with Flatfish Larvae"
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            "content": "in Preparation"
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            ],
            "content": "Another in the series of CalCOFI atlases dealing with distribution of fish larvae on CalCOFI cruises is being prepared for flatfish larvae by Dr. E. Ahlstrom, Senior Scientist at the La Jolla Lab- oratory. Two genera and six species will be included in the atlas as follows: Citharichthys spp., Pleuronichthys spp., Citharichthys stigmaeus, Paralichthys californicus, Lyopsetta exilis, Parophrys vetulus, Microstomus pacificus, and Glyptocephalus zachirus. The 6 year period, 1955-1960, the period for which individual status records for these species are most readily available, are being covered in the atlas. The distribution records were compiled by Dr. E. Ahlstrom, and Biological Technician Elaine Sandknop who verified several dozen records that were questionable, a necessary quality control procedure. About half of these proved to be valid records, the other half were misidentifications. The atlas will give monthly distributions for the several flatfish that are taken most commonly in CalCOFI collections, and for less common forms, distribution will be compiled by quarters, or by 4-month groupings. The atlas will follow the procedure established for CalCOFI Atlas #17, which provided information on 6 common mesopelagic species, including illustrations for each species and a brief description of its distinc- tive larval features. The distribution charts which have already been roughed out by the Scripps Institution of Oceanography are ready for preparing in final form. Mr. John Wylie of Scripps is super- vising the preparation of the distribution charts."
        },
        {
            "spans": [
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            "content": "It has often been pointed out that 12 kinds of larvae (10 species, 2 genera) contribute about 90% of the larvae taken on CalCOFI cruises. With the completion of this atlas, distribution charts of 11 of these 12 kinds will have been covered in CalCOFI atlases. Only rockfish larvae, Sebastes spp., have yet to be covered in CalCOFI atlases."
        },
        {
            "spans": [
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            "content": "Study to Examine Usefulness of Mathematical Technique for Analysis of Catch per Unit Effort Data"
        },
        {
            "spans": [
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            ],
            "content": "Mr. J. Zweifel, Mathematician and Dr. Paul Smith, Fishery Biologist at the La Jolla Laboratory have initiated a study to examine the"
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            "content": "22"
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            "content": "usefulness of the negative binomial distribution in relation to several aspects of the analysis of what may be described generally as catch per unit effort data used widely to estimate the abundance of populations. In operational fisheries, effort fluctuates widely in response to a variety of physical, environ- mental, economic, areal and temporal constraints. In scientific surveys, attempts are made to make the effort as uniform as possible to insure that the effective unit of effort does not change. Operationally, this becomes an impossible task since surveys must be carried out under limitations very similar to those encountered in commercial or recreational fisheries. Thus the problems inherent in data reduction are common to both scientific investigations and fishery statistics."
        },
        {
            "spans": [
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            ],
            "content": "Usually, measures of central tendency (mean) and variability (variance) are desired. Most analysis techniques require some assumptions about the universe or populations from which the samples (catch) were collected, such as the nature of the vari- ability (additive or multiplicative) and the general form of the frequency distribution. The extreme characteristics with which one must deal are strongly right skewed distributions or a large zero class. The first eliminates the normal and the second presents difficulties with the log-normal, the two most widely used distri- butions. This study will examine the negative binomial distribuion, al intermediate alternative having much theoretical appeal and most often found when fish are forming schools or shoals as a basis for statistical analysis. Recently, published work has pointed the way toward utilizing this model with variable size of experiment (effort)."
        },
        {
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            "content": "*"
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            ],
            "content": "Mr. James Squire, in charge of compiling statistics for the Coopera- tive Marine Gamefish Tagging Program at the La Jolla Laboratory, reports that during the first half of 1975 a total of 947 fish have been tagged and released using equipment furnished the laboratory. The billfish season at the tip of Baja California is still continuing and with the black marlin fishery scheduled to start off Cairns, Australia in September, it appears that the number of billfish reported tagged in 1975 should equal or exceed the number tagged in 1974."
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            "content": "The total number of fish reported tagged consists of 538 striped marlin, 279 black marlin, 10 blue marlin and 54 sailfish. A total of 66 other species were tagged, ranging from mako sharks off New Zealand to white sturgeon in San Francisco Bay."
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            "content": "23"
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            ],
            "content": "Preliminary counts of fishing effort and numbers of billfish caught during 1974 are being made by Mr. Squire from information supplied by anglers responding to the billfish angler survey postcard form. The postcard form was distributed to 1,800 anglers together with the annual tagging reports prepared by Mr. J. Squire. In addition, 7,000 postcards were distributed by the International Gamefish Association to angler clubs throughout the world. The postcard form requests information from anglers on the number of days fishing in 1974 by quarter, and the catch of billfish, by species and by quarter."
        },
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            "content": "The total number of anglers reporting billfish catches through- out the Pacific is 766 as of this date. This survey has been conducted annually since 1969 by Mr. Squire. This year it is expected that with the active cooperation of the International Gamefish Association, the 1975 angler response will be the largest ever."
        },
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            "content": "TUNA ASSESSMENT AND DEVELOPMENT INVESTIGATIONS"
        },
        {
            "spans": [
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            "content": "Threadfin Shad Tested as Live Bait in Hawaii's Skipjack Tuna Fishery"
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            "content": "The Honolulu Laboratory and the Vocational Technology Department of Leeward Community College have joined forces to test the feasibility of threadfin shad as live bait for the Hawaiian skipjack tuna fishery. The initial plan is to take approxi- mately 150 buckets (1,500 pounds) of shad from Wahiawa Reservoir weekly during the month of June. These fish are being made available to local fishing vessels after acclimatization to salt water at the Honolulu Laboratory's Kewalo Basin Facility. The object of this undertaking is to give the threadfin shad a thorough test as skipjack tuna live bait during the summer months. So far this year, however, most of the available skipjack tuna have been small fish and even they are scarce. Ideally, shad should be tested during peak fishing when fish are running larger. Commercial fishing vessels, Easy Rider, Anela, Kilohana and Electa have all taken shad to sea. None of the skipjack tuna fishing boats are returning with good catches at present, regardless of the bait they are carrying."
        },
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            "content": "24"
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            "content": "* *"
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            ],
            "content": "The baitfish transport project is gearing up in Tiburon, where Fishery Biologist Roger Green of the Honolulu Laboratory is preparing for further holding experiments using northern anchovy. He is purchasing tanks, plumbing supplies, and other materials necessary to the construction of the facilities. Actual experi- ments to test the effects of handling methods, salinity levels, and density of packing on anchovy survival are expected to begin by mid-July. Mr. Green is being assisted by two temporary employees, Messrs. Smith and Goddard."
        },
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            "content": "Skipjack Tuna Population Dynamics Literature Search Completed for Overiew"
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        {
            "spans": [
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            "content": "The major research emphasis of the Tuna Monitoring and Assessment Task is on fishery analysis of the skipjack tuna resource in the Pacific and Indian Oceans. In addition, the status of exploited stocks of other tuna and tuna-like resources that are of U.S. concern are monitored through the systematic collection and analysis of fisheries data. Continuing the assessment of skipjack tuna resources, Task Leader Dr. Robert Skillman completed the literature search for an overview of population dynamics of skipjack tuna. This overview will be part of a report on the fishery biology of skipjack tuna being prepared by Mr. Walter Matsumoto, Fishery Biologist in the MARMAP III Task."
        },
        {
            "spans": [
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            "content": "Examination of Solomon Islands Skipjack Tuna Catch and Effort Statistics"
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            "spans": [
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            "content": "At the request of the Honolulu Laboratory Director, Fishery Biologist Richard Uchida studied catch and effort statistics collected in the skipjack tuna fishery in the British Solomon Islands Protectorate, and drafted recommendations for analysis of the data. Mr. Uchida also collaborated with several staff members in designing two new forms for use in the shad-anchovy testing program. Called the Aku Boat Interview Record and the Aku Boat Observation Record, these forms will be put to use immediately by Investigation personnel."
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            "content": "25"
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            "content": "* *"
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                }
            ],
            "content": "Fishery Biologist Howard Yoshida has begun preparation of \"status reports\" on the bonitos and the little tunas of the world. Two reports are planned, one on bonitos and the other for the little tunas; they will be prepared to facilitate the work of the FAO Working Party on Development of Fisheries on Species of Small Tunas and Related Species."
        },
        {
            "spans": [
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            ],
            "content": "Hawaii's \"Season\" Skipjack Tuna are Straggling Into the Fishery"
        },
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            ],
            "content": "The catch of skipjack tuna in the Hawaiian pole-and-line fishery reached an estimated 325.1 metric tons (MT) in June. This is 206.9 MT below the catch in June 1974 and 441.0 MT lower than the June average for the years 1948-74. The catch for the first 6 months of 1975 is estimated at 1,165.6 MT, 461.8 MT below last year's catch for the same period and 676.0 MT below the long-term average."
        },
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            ],
            "content": "During the period May 19 to June 27, the lengths of 1,603 albacore from 34 fishing vessels were recorded in Pago Pago by Government of American Samoa employee Pulou Niuatoa. He also collected 40 sets of catch and effort data. Utilizing data from only seven vessels, an average size of 85.3 cm was determined together with an albacore catch per 100 hooks of 0.61."
        },
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            ],
            "content": "ENDEX/OASIS Computerized Referral Service Available at NOAA Environmental Data Service/National Oceanographic Data Center Liaison Office at Southwest Fisheries Center"
        },
        {
            "spans": [
                {
                    "offset": 60051,
                    "length": 266
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            ],
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                }
            ],
            "content": "Mr. Nelson Ross, EDS/NODC Liaison Officer at the Southwest Fisheries Center in La Jolla, announced this month that direct computerized referral access to the ENDEX (Environmental Data Index)/OASIS (Oceanic and Atmospheric Scientific Information) is available through"
        },
        {
            "spans": [
                {
                    "offset": 60318,
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            "content": "26"
        },
        {
            "spans": [
                {
                    "offset": 60321,
                    "length": 424
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            ],
            "boundingRegions": [
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                    "pageNumber": 31,
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            ],
            "content": "his office at the Center. ENDEX/OASIS provides rapid computerized referral to available environmental data and information files of NOAA, other Federal agencies, state and local governments, and private industry. Subject areas include aeronomy, cartography, climatology, coastal zone management, environment-related engineering, geodesy, hydrography, marine geography, meteorology, oceanography, and space and solar science."
        },
        {
            "spans": [
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            ],
            "content": "ENDEX contains computer-searchable descriptions of interdisciplinary files of environmental data on many levels. OASIS is a computerized information retrieval service that provides ready reference to the technical literature and to research in environmental sciences and marine and coastal resources. OASIS offers access to major meteor- ological and oceanic bibliographic information files not available anywhere else in the U.S. in computer-searchable form."
        },
        {
            "spans": [
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            ],
            "content": "Computerized data bases available exclusively through ENDEX/OASIS are: Aquaculture Information System; Biological Information Retrieval System; Environmental Data Base Directory; Meteorological and Geo- astrophysical Abstracts; NODC Index for Instrument Measured Subsurface Current Observations; Oceanic Index; Bottom Photograph Camera Station File. In addition, other computerized data bases, such as air- pollution abstracts, and 24 others, are available through ENDEX/OASIS."
        },
        {
            "spans": [
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            "content": "For descriptions of the data bases, information and/or demonstrations of the ENDEX/OASIS system, those interested should contact Mr. Ross at the Center (telephone number 453-2820, etc. 204)."
        },
        {
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            "content": "PUBLIC RELATIONS - SOUTHWEST FISHERIES CENTER"
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            ],
            "content": "June 18 Mr. Robert Nishimoto, Fishery Biologist, La Jolla Laboratory, was host to Mr. William Fuselman and 20 students from Mt. Miguel High School in San Diego. Mr. Nishimoto discussed albacore research and the results of cooperative work with the American Fishermen's Research Foundation."
        },
        {
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            ],
            "content": "June 26-29 The first three panels of a six-panel permanent dis- play being prepared at the Honolulu Laboratory have been completed and were exhibited at the Hawaii Outdoor Sports Show at the Ala Moana Shopping Center."
        },
        {
            "spans": [
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            "content": "27"
        },
        {
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            ],
            "content": "June 27 Thirty participants in the East-West Center's Prawn Farming Systems : Techniques Workshop were brought to the Honolulu Laboratory library by workshop coordinator Richard Gibson. Members of the group, representing Indonesia, Israel, Malaysia, Mexico, Philippines, Singapore, Sri Lanka, Thailand, and the United States, will be utilizing the Honolulu Laboratory library resources during the period of the workshop, June 25 to September 5."
        },
        {
            "spans": [
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            ],
            "content": "The following press release was issued to West Coast news sources by the Southwest Fisheries Center in June:"
        },
        {
            "spans": [
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                    "offset": 62986,
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            ],
            "content": "June 18 Improved Albacore Fishing Predicted off Central and Southern California"
        },
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            "content": "SEMINARS"
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            "content": "Honolulu Laboratory"
        },
        {
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            ],
            "content": "June 4 Dr. Robert A. Skillman, Fishery Biologist with the Honolulu Lagboratory, spoke to the staff on \"Growth of skipjack tuna in Hawaiian waters, based on capture- recapture data.\""
        },
        {
            "spans": [
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            ],
            "content": "June 6 Dr. Garth Murphy, CSIRO, Australia, gave an informal quick rundown on the Australian fisheries scene."
        },
        {
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            ],
            "content": "June 18 Dr. John E. Bardach, Director, Hawaii Institute of Marine Biology, spoke on \"Constraints of aquatic animal husbandry\" in the seminar room of the Honolulu Laboratory."
        },
        {
            "spans": [
                {
                    "offset": 63560,
                    "length": 2
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            "content": "28"
        },
        {
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            ],
            "content": "MEETINGS AND TRAVEL"
        },
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            ],
            "content": "June 2 A majority of the Honolulu Laboratory staff members went on an all-day field trip to the Hawaii Institute of Marine Biology and the Naval Undersea Center."
        },
        {
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            "content": "2-3 Mr. Norman J. Abramson, Tiburon Laboratory Director, attended a meeting of the Southwest Fisheries Center, La Jolla, of the State/Federal Steering Committee."
        },
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            "content": "3 A State/Federal Resource Assessment Project meeting was held to discuss contracting arrangements and the direction of further research on sportfish species, during the next fiscal year at the SWFC. The meeting was attended by representatives of the California Department of Fish and Game, the Southwest Region, and Messrs. Lasker, Mackett, Stauffer and MacCall (California Department of Fish and Game Biologist at the SWFC)."
        },
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            "content": "5 Mr. Richard Shomura, Director, Honolulu Laboratory, attended a meeting of the Natural Area Reserves Commission."
        },
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            "content": "6 Mr. Shomura attended a farewell luncheon for Dr. Jack Davidson, who is leaving his directorship position at the University of Hawaii Sea Grant Programs in mid-July."
        },
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            ],
            "content": "8-15 Dr. Edmund S. Hobson, Tiburon Laboratory, attended the annual meeting of the American Society of Ichthyologists and Herpetologists at Williamsburg, Virginia, where he presented a paper on feeding relationships of fishes at Catalina Island, California."
        },
        {
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            ],
            "content": "15-19 Mr. Susumu Kato, Tiburon Laboratory, travelled to Puget Sound to meet with various people engaged in salmon culture and research. He visited with personnel of the Northwest Fisheries Center, University of Washington, and the Washington Department of Fisheries. Mr. Kato made on-site inspections of salmon rearing facilities of Domsea and Weyerhauser companies."
        },
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            ],
            "content": "16-20 Center Director Rothschild travelled to Washington, D. C. to attend the Regional/Center Directors' Meeting."
        },
        {
            "spans": [
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            "content": "29"
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            "content": "June 17 A meeting of the California Marine Research Committee which sponsors the California Cooperative Oceanic Fisheries Investigations (CalCOFI) was held at the Center. The Committee discussed in detail cooperation with the Mexican government on fisheries research problems of mutual interest in the CalCOFI area (from off northern California to the tip of Baja California, Mexico, and seaward 200 miles) and endorsed proposals for joint research to be presented at the forthcoming meeting of Mexican scientists and representatives of CalCOFI, including Dr. Reuben Lasker for the NMFS Southwest Fisheries Center, in Mexico, June 26-27."
        },
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            ],
            "content": "17-22 Dr. Geoffrey Moser of the La Jolla Laboratory travelled to Boulder, Colorado to attend a conference of review- ers for DOMES research grants."
        },
        {
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            ],
            "content": "18 Mr. Shomura and Mr. Tamio Otsu met with Dean Ken Kamimura of Leeward Community College regarding LCC students' involvement in our shadding project."
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            "content": "19-20 Mr. Shomura attended the Pacific Tuna Development Founda- tion meetings at the Hawaii State Capitol."
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            "content": "20 The Salmon Rearing Committee, consisting of personnel from the Tiburon Laboratory, Sea Grant Program, and the Tyee Club, held its regularly scheduled meeting."
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            "content": "20 Dr. Jeannette Struhsaker and Maxwell Eldridge visited the Southwest Fisheries Center, La Jolla Laboratory, to discuss striped bass research with Drs. Reuben Lasker, John Hunter and Krishna Lal (the latter a Fishery Biologist with the California Department of Fish and Game)."
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            "content": "23 Dr. William Lenarz, in charge of the Porpoise/Tuna program at the La Jolla Laboratory, attended a Marine Mammal Commission-sponsored workshop on Tursiops truncatus (bottlenose dolphin) stock assessment in Miami. The group discussed research needs and gave highest priority to an aerial survey of the Florida stocks of Tursiops."
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            "content": "June 23 Mr. Steven C. Tator, Investigator, and Ms. Blanche Deight of the Federal Trade Commission, Los Angeles, met with Mr. Shomura, Director at the Honolulu Laboratory, during the course of their investigation of the tuna industry relative to anti-trust activities."
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            "content": "24-25 The Tuna Policy Committee, appointed by NMFS Director Shoning recently to advise him on tuna-related pro- grams and policy, chaired by Brian J. Rothschild, SWFC Director, met at the Center to discuss procedures and outlined as an important first priority the need to express to Mr. Schoning the various views of the tuna industry. As Chairman, Dr. Rothschild sent a letter to top industry officials asking that they meet with him and Committee members Gerald V. Howard, Southwest Regional Director, and Carmen Blondin, Vice Chairman, Assistant Director for International Fisheries, to discuss present problem areas and future problems that may arise in the tuna industry in the future. A series of meetings with industry officials is in progress."
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            "content": "25 Mr. Shomura attended the opening ceremony of the Prawn Workshop at the East-West Center. The Prawn Farming Systems: Techniques Workshop runs from June 25 to September 5 and is jointly sponsored by the Food Institute of the EWC and the Hawaii Division of Fish and Game."
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            "content": "27"
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            "content": "Mr. Shomura called a meeting of the ad hoc Baitfish Committee to discuss the results of the recent PTDF meeting and future plans for baitfish activities in Hawaii."
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            "content": "30"
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            "content": "Center Director Rothschild and Mr. D. Mackett attended a State/Federal Steering Committee meeting at Terminal Island. Terms of the reference of the Committee will concern coordination of joint State/Federal fisheries research in the future."
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        {
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            "content": "31"
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            "content": "VISITORS"
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            "content": "Honolulu Laboratory"
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            "content": "June 5 Mr. Stetson Tinkham, NMFS, Washington, D.C."
        },
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            "content": "6 Ms. Eileen Lum. Leeward Trollers, Honolulu"
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            ],
            "content": "10 Mr. Wayne Baldwin, HIMB, Kaneohe"
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            ],
            "content": "Mr. Rich Braley, fisheries Division, Department of Agriculture, Nuku'alofa, Tonga"
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            "spans": [
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            ],
            "content": "16 Mr. Ray Rounds, Kailua High School, Kailua, Oahu"
        },
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            ],
            "content": "26 Mr. Dougles Weber, NMFS, Seattle, accompanied by Mr. Henry Sakuda, Hawaii Division of Fish and Game"
        },
        {
            "spans": [
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            "content": "La Jolla Laboratory"
        },
        {
            "spans": [
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            ],
            "content": "2 Mr. Peter Castle, University of New Zealand, Wellington, New Zealand"
        },
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            ],
            "content": "4 Dr. Robert F. Dill, Environmental Coordinator, Department of Interior, Washington, D.C."
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        {
            "spans": [
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            ],
            "content": "9 Mr. Robert L. Ward, Porter Junior High School, Fallbrook, California"
        },
        {
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            "content": "16 Mr. Fred Weiss, Research Chemist, Shell Development Company, Houston, Texas"
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            ],
            "content": "18 Professor A. Takagi, Fishing Boat Association of Japan, Tokyo"
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            ],
            "content": "Mr. G. Ueta, Miho Shipyard Co., Shimizu, Japan Mr. A. Kasahara, Kanesashi Shipbuilding Co., Ltd., Shimizu, Japan"
        },
        {
            "spans": [
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            "content": "32"
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            "content": "June 18"
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            "content": "Mr. K. Baha, Furuno Electric Co., Nishinomiya, Japan"
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            "content": "Mr. T. Sugimura, Miho Shipyard Co., Ltd., Shimizu, Japan"
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            "content": "Mr. T. Harumoto, Yanmar Diesel Engineering Co., Osaka, Japan"
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            "content": "20 Dr. J. Struhsaker and Mr. Mickey Eldridge, SWFC, Tiburon Laboratory to discuss the striped bass program, slated to begin at Tiburon July 1"
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            ],
            "content": "22-30 Mr. Izadore Barrett, SWFC Deputy Director, now attending the University of Washington, College of Fisheries, during a year's educational leave, visited the Center for discussions of pending fisheries matters"
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            "content": "24-25 Mr. Fred L. Olson, NMFS, Washington, D.C."
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            "content": "Mr. Gerald V. Howard, NMFS Southwest Region, Terminal Island, California"
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            "content": "Tiburon Laboratory"
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            "content": "June 5 Don Aasted, Methods and Equipment Specialist, Honolulu Laboratory, Honolulu, Hawaii"
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            "content": "6 George Barber, Plans and Policies, NMFS, Washington, D.C."
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            "content": "Jim Slawson, Fishery Biologist, Southwest Region, Terminal Island, California"
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            "content": "Fritz Cramer, Resource Management Administrator, Southwest Region, Terminal Island, California"
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            "content": "June 9 Robert Rawstron, California Department of Fish and Game, Sacramento, California"
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            "content": "20 Carl Eschler, President, Tyee Club, San Francisco, California"
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            "content": "Robert Brown, Tyee Club, San Francisco, California Sam De Mero, Tyee Club, San Francisco, California Stan Hearst, Tyee Club, San Francisco, California Frank Dyer, Tyee Club, San Francisco, California Chris DeWees, Sea Grant Program, University of California at Davis, Davis, California"
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            "content": "June 6 Cynthia Unninayar, Physical Science Technician, Termination of Temporary Appointment Honolulu"
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            "content": "9 John Thompson, Biological Aid, Termination La Jolla"
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            "content": "16 Hilary Hogan, Physical Science Aid, Pay Adjustment La Jolla"
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            "content": "22 Ronald C. Dotson, Biological Technician, Promotion La Jolla"
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            "content": "25 Oliver Seth, Biological Aid, Termination La Jolla"
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            "content": "28 Helen Caouette, Clerk-Typist, Resignation La Jolla"
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            "content": "30 Vince Di Meo, Summer Aid, Temporary Appointment La Jolla"
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            "content": "30 Antoinette Banda, CETA Enrollee, Termination"
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