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Lake Victoria Fish Stocks and the Effects of Water Hyacinths on the Catchability of Fish

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  • Kateregga, Eseza
  • Sterner, Thomas

Abstract

This paper analyses the effects of the invasion of water hyacinths on fishing in Lake Victoria. We built two fairly standard Schaefer-type models that have one innovation: they allow the water hyacinth abundance to affect catchability. We estimated static and dynamic CPUE (catch per unit of effort) functions for Lake Victoria fisheries. We investigated the trend in the lake’s stocks during the period 1983–2000 and focused particularly on the effect of the water hyacinth on fish stocks and on catchability coefficients. The results shows that while fish stocks have fallen since 1990, this decline appears to have been at least temporarily halted by the declining catchability of fish due to the growing abundance of water hyacinths. The impact of the hyacinth on the catchability of fish was greatest in the Kenyan section of Lake Victoria. Although the hyacinths had many negative effects, one important effect has been to effectively hinder fishing and, thereby—paradoxically—stop or at least postpone serious overfishing.

Suggested Citation

  • Kateregga, Eseza & Sterner, Thomas, 2008. "Lake Victoria Fish Stocks and the Effects of Water Hyacinths on the Catchability of Fish," RFF Working Paper Series dp-08-05-efd, Resources for the Future.
    • Handle: RePEc:rff:dpaper:dp-08-05-efd
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    File URL: http://www.rff.org/RFF/documents/EfD-DP-08-05.pdf
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    References listed on IDEAS

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    Cited by:

    1. Frank Jensen & Lars Gårn Hansen, 2017. "The welfare gain from switching to tax regulation of fisheries," IFRO Working Paper 2017/07, University of Copenhagen, Department of Food and Resource Economics.

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    More about this item

    Keywords

    Water hyacinth; catchability coefficients; Lake Victoria fish stocks;
    All these keywords.

    JEL classification:

    • Q22 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Renewable Resources and Conservation - - - Fishery
    • Q57 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Ecological Economics

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