FISHERIES 2021 JUN SWG WCRL02 Updated combined Poaching trends.pdf (408.1 kB)
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Updated trends in poaching for West Coast rock lobster from modelling the “old” and the “new” databases simultaneously

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Updated results are given for an approach which simultaneously models the “old” and the “new” databases as recommended by the Panel for the 2018 International Fisheries Stock Assessment Workshop, with poaching data for 2019 now included. These results are compared to those obtained previously. For cases where the “old” database is upweighted, the 2019 poaching indices estimated for both the northern Super-areas (3-7) and for the southern Super area 8+ show statistically significant increases compared to 2018. A three-point smoothing approach is used for converting the poaching series obtained as outputs to the input series used in the assessments.

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Department of Mathematics and Applied Mathematics, University of Cape Town