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Abstract
The Nile perch fishery of Lake Victoria is regulated with a slot size and with restrictions on legal gear sizes. This study provides an assessment of the effectiveness of the the slot size regulation by simulating the Nile perch fishery with a size structured population model where the size preference of the fishery is an input into the model. The model is compared to the size structure of the Nile perch population from three empirical surveys to find agreement between the model, the bottom-trawl and the catch assessment survey, while the hydroacoustic survey predicts a different population structure. The empirical fishing mortality is 2.0% above the value that produces the maximum sustainable yield, given the empirical fishing fleet selectivity. Next to the actual fleet selectivity, three alternatives are simulated to quantify the effect of the selectivity. We find that the annual yield could be increased by 17.7% by sparing fish below 50cm.
Document type: | Working paper |
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Series Name: | Discussion Paper Series / University of Heidelberg, Department of Economics |
Volume: | 0720 |
Place of Publication: | Heidelberg |
Date Deposited: | 02 Nov 2022 13:02 |
Date: | October 2022 |
Number of Pages: | 44 |
Faculties / Institutes: | The Faculty of Economics and Social Studies > Alfred-Weber-Institut for Economics |
DDC-classification: | 330 Economics |
Uncontrolled Keywords: | Nile perch, size-structured population model, maximum sustainable yield, fleet selectivity, slot size |
Series: | Discussion Paper Series / University of Heidelberg, Department of Economics |