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FISHERIES_2023_OCT_SWG-DEM_09 Updated 2023 horse mackerel assessments and projections final.pdf (1.3 MB)

Updated 2023 horse mackerel assessments and projections

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posted on 2024-01-30, 11:53 authored by Susan HollowaySusan Holloway, Doug ButterworthDoug Butterworth

This document reports updated 2023 horse mackerel assessments, along with constant midwater catch projections for the updated base case model and various model variants in the light of a marked drop in the Desert Diamond CPUE, as well as a sensitivity run to increasing the PUCL for the by-catch by the pelagic fishery. Full model descriptions are provided along with the updated input data. It is preliminarily suggested that despite the Desert Diamond CPUE drop, the midwater TAC should be maintained at its 2023 level, but that the possible reasons for that drop need further discussion. Furthermore, is suggested that the PUCL3 value for the pelagic fishery be increased from 12 000 to 15 000 mt.

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Department of Mathematics and Applied Mathematics, University of Cape Town