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Size selective fishing: The effect of size selectivity on the equilibrium yield in the Nile perch fishery of Lake Victoria

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  • Kammerer, Johannes
  • Gomez-Cardona, Santiago
  • Nyamweya, Chrisphine

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.

Suggested Citation

  • Kammerer, Johannes & Gomez-Cardona, Santiago & Nyamweya, Chrisphine, 2022. "Size selective fishing: The effect of size selectivity on the equilibrium yield in the Nile perch fishery of Lake Victoria," Working Papers 0720, University of Heidelberg, Department of Economics.
    • Handle: RePEc:awi:wpaper:0720
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    References listed on IDEAS

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    1. Gómez-Cardona, Santiago & Kammerer, Johannes & Mrosso, Hillary, 2022. "Fishing Fleet Selectivity in Lake Victoria's Nile Perch Fishery," Working Papers 0712, University of Heidelberg, Department of Economics.
    2. Natugonza, Vianny & Ogutu-Ohwayo, Richard & Musinguzi, Laban & Kashindye, Benedicto & Jónsson, Steingrímur & Valtysson, Hreidar Thor, 2016. "Exploring the structural and functional properties of the Lake Victoria food web, and the role of fisheries, using a mass balance model," Ecological Modelling, Elsevier, vol. 342(C), pages 161-174.
    3. Florian Diekert, 2012. "Growth Overfishing: The Race to Fish Extends to the Dimension of Size," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 52(4), pages 549-572, August.
    4. Andrew Brierley, 2018. "Poaching Lake Victoria’s fish for traditional Chinese medicine," Nature, Nature, vol. 553(7686), pages 27-27, January.
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    Cited by:

    1. Gómez-Cardona, Santiago & Kammerer, Johannes, 2023. "Impact of Gear Choice on Open Access Fisheries: A Study on Fishery Regimes," Working Papers 0732, University of Heidelberg, Department of Economics.

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    Keywords

    Nile perch; size-structured population model; maximum sustainable yield; fleet selectivity; slot size;
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