Directly to content
  1. Publishing |
  2. Search |
  3. Browse |
  4. Recent items rss |
  5. Open Access |
  6. Jur. Issues |
  7. DeutschClear Cookie - decide language by browser settings

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

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

[thumbnail of Kammerer_Gomez-Cardona_Nyamweya_size_selected_fishing_2022.pdf]
PDF, English
Download (1MB) | Terms of use

Citation of documents: Please do not cite the URL that is displayed in your browser location input, instead use the DOI, URN or the persistent URL below, as we can guarantee their long-time accessibility.


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
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
About | FAQ | Contact | Imprint |
OA-LogoDINI certificate 2013Logo der Open-Archives-Initiative