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Fishing Fleet Selectivity in Lake Victoria's Nile Perch Fishery

Author

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  • Gómez-Cardona, Santiago
  • Kammerer, Johannes
  • Mrosso, Hillary

Abstract

Current regulations regarding the Nile Perch Fishery in Lake Victoria provide gear specifications for the two main gears employed, Gillnets and Longlines, by defining the minimum size available. Additionally, the legal range of catchable fish is regulated: between 50 and 84 cm. Gillnets are legal over 5 inches, and the Hooks, required for Longlining, are legal from number 10 and below (lower numbers refer to higher sizes). Using data from the Catch Assessment Survey, CAS, we identify gear selectivity for Gillnets and Longlines. We use a novel methodology, that is validated using previous results for Gillnets for Lake Victoria. This is particular relevant as there is no much data for selectivity using Longlines. The information on selectivity is used to derive the overall fishing selectivity of the fleet. We find evidence of shift towards higher fish sizes in the Gillnet fleet, but a stagnation on fish sizes for the Longline fleet, even though there has been a compositional change in the hook sizes employed for this activity. The results signal towards a regulatory success among Gillnet users, but challenges in the regulation of Longliners.

Suggested Citation

  • 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.
    • Handle: RePEc:awi:wpaper:0712
    Note: This paper is part of http://archiv.ub.uni-heidelberg.de/volltextserver/view/schriftenreihen/sr-3.html
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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.
    2. 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.

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