Testing time-varying selectivity models of the South Coast rock lobster with data generated by a model with spatial structure
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2011
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University of Cape Town
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Abstract
Both gear selectivity and availability combine to form selectivity. When selectivity is allowed to change with time, it is difficult to determine the source of the variation. If availability changes with time, perhaps as a consequence of changing spatial distributions of fishing effort, selectivity-at-age will appear to vary over time. It then becomes unclear how to renormlise selectivity so that the catchability q which relates CPUE to underlying abundance does not change. This study uses a model with spatial structure in the age distribution of the population together with changes in the spatial distribution of fishing over time to simulate variations in availability. The model is used to generate data for simulation testing of two different approaches to modeling time-varying selectivity.
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Furman, L. B., & Butterworth, D. S. (2011). Testing time-varying selectivity models of the South Coast rock lobster with data generated by a model with spatial structure. MARAM: University of Cape Town.