An updated statistical catch-at-length assessment for Eastern Atlantic bluefin tuna
Butterworth and Rademeyer (2013) provided an initial Statistical Catch-at-Length (SCAL) assessment of the eastern populations of North Atlantic bluefin tuna. The primary purpose in fitting to length- rather than to age distribution data was to avoid the need to make use of the somewhat coarse cohort...
Main Authors: | , |
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Format: | Report |
Language: | unknown |
Published: |
University of Cape Town
2022
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Online Access: | https://dx.doi.org/10.25375/uct.19114640.v1 https://zivahub.uct.ac.za/articles/report/An_updated_statistical_catch-at-length_assessment_for_Eastern_Atlantic_bluefin_tuna/19114640/1 |
Summary: | Butterworth and Rademeyer (2013) provided an initial Statistical Catch-at-Length (SCAL) assessment of the eastern populations of North Atlantic bluefin tuna. The primary purpose in fitting to length- rather than to age distribution data was to avoid the need to make use of the somewhat coarse cohort-slicing method to provide the latter. Here these analyses are updated using comparable inputs to those agreed for the initial 2014 updated VPA assessments. The results suggest a spawning biomass time series similar to that estimated by VPA over the 1975 to 2005 period, but lower after and appreciably higher before this period. |
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