University of Cape Town
FISHERIES_2022_AUG_SWG-DEM_12 Hake 2022 RS conditioning results_final.pdf (3.25 MB)

Conditioning results for the 2022 Hake Reference Set Operating Models for OMP testing

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posted on 2022-10-13, 10:21 authored by Andrea Ross-GillespieAndrea Ross-Gillespie, Doug ButterworthDoug Butterworth

Results are presented for the conditioning of the 2022 hake Reference Set (RS) of Operating Models (OMs) to be used in testing OMP-2022. Contrary to the 2018 RS, all models estimate both species to be above π΅π‘€π‘†π‘Œ. Some of the estimates of the survey catchability coefficients are unrealistically high, but this is most likely a consequence of trade-offs between fitting to different types of data, rather than simply biologically unrealistic results. The Ricker models appear to have multi-modal likelihood surfaces with β€œswitching” between the M. capensis stock recruitment parameters, but in all cases estimates of abundance remain above π΅π‘€π‘†π‘Œ.



Department of Mathematics and Applied Mathematics, University of Cape Town