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Impact of sampling strategy on estimates of hake survey length distributions and the proportions of hake in the hake diet: a summary of work to date

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posted on 2022-02-28, 04:40 authored by Andrea Ross-GillespieAndrea Ross-Gillespie, Doug ButterworthDoug Butterworth
The hake cannibalism and inter-species predation model that is currently being developed by Ross-Gillespie and Butterworth has thus far failed to reflect both a biologically feasible estimate of daily ration and the proportion of hake in the diet of hake predators indicated by the diet data obtained during surveys. Andre Punt made a suggestion to investigate the sampling strategy used to obtain the diet data, in order to ascertain whether this strategy might be giving rises to biases in the estimates for the population as a whole of both the length distributions and the proportions of hake in the diet of hake predators. Technical details are not presented in this brief summary document, but the general lines of investigation is summarised..

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Department of Mathematics and Applied Mathematics, University of Cape Town