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- W195808974 abstract "Albacore tuna caught by trolling in New Zealand waters during the 2003–04 fishing season were sampled in fish sheds to determine the length frequency composition and length-weight relationship. This season albacore were sampled from three ports, Auckland, New Plymouth and Greymouth. Albacore sampled in the 2003−04 fishing year had a mean fork length of 64.3 cm, and ranged in size from 40−94 cm, with nearly all fish (99%) in the 52−76 cm range. Length:weight relationships were determined. Log of fork length plotted against log of green weight produced a significant linear relationship (R=0.92). Nearly all of the albacore sampled in the troll fishery over an eight year period from 1996−97 to 2003−04 were in the 47−81 cm size range (99%), with a mean fork length of 63.3 cm. There is considerable variability in the size composition from year to year. Size frequency of the troll catch is compared with the New Zealand observed longline catch of albacore. Longline caught albacore are larger, with an average fork length of 80.0 cm, and most fish (99%) in the 56−104 cm size range. Albacore caught by trolling around the New Zealand coast tend to be smaller than those caught by troll vessels from the U.S.A. fishing in the sub-tropical convergence zone, the only other surface fishery for the South Pacific albacore stock. Fish caught by longline throughout the South Pacific are all larger sub-adult and adult fish. Continued monitoring of the catch composition of juvenile albacore in the New Zealand troll fishery is a critical input to the length-based regional stock assessment of the South Pacific albacore stock. The New Zealand fishery catches up to half of the total removals of juveniles from this stock and is one of only a few target fisheries for this stock. Failure to monitor size composition in this stock would appreciably increase uncertainty of stock assessments." @default.
- W195808974 created "2016-06-24" @default.
- W195808974 creator A5063969105 @default.
- W195808974 date "2004-01-01" @default.
- W195808974 modified "2023-09-27" @default.
- W195808974 title "Monitoring the length structure of New Zealand commercial landings of albacore during the 2003/04 fishing year" @default.
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- W195808974 hasPublicationYear "2004" @default.
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