The Tuna-Porpoise Problem: Dedicated Vessel Research Program. Summary of Research Results from the Second Leg of the Third Cruise of the Dedicated Vessel. 20 July to 18 August 1978. III2
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The Tuna-Porpoise Problem: Dedicated Vessel Research Program. Summary of Research Results from the Second Leg of the Third Cruise of the Dedicated Vessel. 20 July to 18 August 1978. III2

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  • Personal Author:
  • Corporate Authors:
    Southwest Fisheries Center (U.S.)
  • NOAA Program & Office:
    NMFS (National Marine Fisheries Service)
  • Description:
    The National Marine Fisheries Service, the Marine r-1amnial Commission, and the United States Tuna Foundation sponsored the tuna seiner M/V Queen Mary during 1978 as a 1 1dedicated vessel11 to study the tuna/ porpoise problem. Between 20 July and 18 August the focus of the research was two-fold: porpoise behavior and tuna olfactory attractants. Seventeen porpoise sets were made, more than 5600 were captured, 49 tons of tuna were captured and three porpoise were killed. The behavioral investigators, using the focal animal sampling method, made most of their observations while swimming among the porpoise. With the focal animal sampling method, single animals were observed for 5 minutes, and all of their overt behavior was recorded on slates. A total of 135 5-minute case observations was made. A 1 1 dictionary" of behavioral events occurring in the purse seine was developed so the patterns can be recognized by others. The composition and sizes of various porpoise subgroups were identified. A number of behavioral responses thought to be learned were observed and noted. A composite behavioral sequence for a typical set on this cruise is described. The tuna olfactory attractant was tested on 10 sets. A response from the tuna was observed on only two sets. On one set, a few individuals reacted briefly, however, no response was seen from the whole school. On the other set, 2 tons of tuna responded to the attractant for short periods of time; however, the school did not stay near the attractant for long periods.
  • Keywords:
  • Series:
    Administrative Report ; No. LJ-79-13
  • Document Type:
    Administrative Report
  • Rights Information:
    Public Domain
  • Compliance:
    Library
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