eprintid: 32308
rev_number: 19
eprint_status: archive
userid: 3114
dir: disk0/00/03/23/08
datestamp: 2022-11-02 13:02:55
lastmod: 2022-12-15 14:24:30
status_changed: 2022-11-02 13:02:55
type: workingPaper
metadata_visibility: show
creators_name: Kammerer, Johannes
creators_name: Gomez-Cardona, Santiago
creators_name: Nyamweya, Chrisphine
title: Size selective fishing: The effect of size selectivity on the equilibrium yield in the Nile perch fishery of Lake Victoria
subjects: ddc-330
divisions: i-181000
keywords: Nile perch, size-structured population model, maximum sustainable yield, fleet selectivity, slot size
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.
date: 2022-10
id_scheme: DOI
id_number: 10.11588/heidok.00032308
schriftenreihe_cluster_id: sr-3
schriftenreihe_order: 0720
ppn_swb: 1822550211
own_urn: urn:nbn:de:bsz:16-heidok-323089
language: eng
bibsort: KAMMERERJOSIZESELECT20221019
full_text_status: public
series: Discussion Paper Series / University of Heidelberg, Department of Economics
volume: 0720
place_of_pub: Heidelberg
pages: 44
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 paper]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/32308/7/Kammerer_Gomez-Cardona_Nyamweya_size_selected_fishing_2022.pdf