Filename
FAR-2025-05-Catch-at-age-for-BAR5-and-SKI3-and-SKI7-for-the-2022-23-fishing-year.pdf
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FAR-2025-05-Catch-at-age-for-BAR5-and-SKI3-and-SKI7-for-the-2022-23-fishing-year.pdf (933.9 kb)
Abstract
Catch-at-age data are important for stock assessment because they provide information on the strength and progression of age classes in the stock. These data include information on the length and age, from otoliths (the ear bones of fish), collected at sea by observers from the commercial catch.
This report provides estimation of catch-at-age from the bottom trawl fisheries for barracouta (Thyrsites atun, BAR) in BAR 5 (Southland) and for gemfish (Rexea solandri, SKI) in SKI 3 (southeast coast) and SKI 7 (Challenger) for the 2022–23 fishing year. These results are the third of a three-year catch-at-age series for these two species.
Most of the barracouta were aged 2–5 years and strong and weak cohorts could be tracked across years.
Gemfish from SKI 3 in the 2022–23 fishing year indicated that a large number of age 2 fish were present, but that the age 3 cohort was missing. Ageing error was not thought to explain this discrepancy.
Female gemfish from SKI 7 were generally larger (and older) than males in the bottom trawl catch, and a large number of fish under the age of 3 were present. Augmenting the 2020–21 data with information on smaller (younger) fish from the 2021 West Coast South Island trawl survey added information for fish aged 0–2.
Document date
Friday, 14 February 2025
Document type
V 1.3
File format
Adobe PDF
File size
933.9 kb
Reference number
2025/05
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FAR-2025-05-Catch-at-age-for-BAR5-and-SKI3-and-SKI7-for-the-2022-23-fishing-year.pdf
Uploaded date
Monday, 17 February 2025
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AUTHOR:
Devine, J.A.;
Sutton, C.;
Hart, A.;
Spong, K.;
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