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An updated statistical catch-at-length assessment for Eastern Atlantic bluefin tuna

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posted on 2022-02-18, 12:26 authored by Doug ButterworthDoug Butterworth, Rebecca A Rademeyer
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.



Department of Mathematics and Applied Mathematics, University of Cape Town