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

• Main Authors: Butterworth, Doug, Rademeyer, Rebecca A
• Format: Report
• Language: unknown
• Published: University of Cape Town 2022
• Subjects: 10401 Applied Statistics; FOS Mathematics; 10202 Biological Mathematics; 10402 Biostatistics; Butterworth; North Atlantic
• Online Access: https://dx.doi.org/10.25375/uct.19114640; https://zivahub.uct.ac.za/articles/report/An_updated_statistical_catch-at-length_assessment_for_Eastern_Atlantic_bluefin_tuna/19114640

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.