eprintid: 31341
rev_number: 17
eprint_status: archive
userid: 3114
dir: disk0/00/03/13/41
datestamp: 2022-03-10 12:05:05
lastmod: 2022-04-11 08:14:09
status_changed: 2022-03-10 12:05:05
type: workingPaper
metadata_visibility: show
creators_name: Gómez-Cardona, Santiago
creators_name: Kammerer, Johannes
creators_name: Mrosso, Hillary
title: Fishing Fleet Selectivity in Lake Victoria's Nile Perch Fishery
subjects: ddc-330
divisions: i-181000
keywords: Gear Selectivity, Gillnets, Hooks, Nile Perch Fishery
cterms_swd: Lake Victoria
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.
date: 2022
schriftenreihe_cluster_id: sr-3
schriftenreihe_order: 0712
ppn_swb: 1796240605
own_urn: urn:nbn:de:bsz:16-heidok-313411
language: eng
bibsort: GOMEZCARDOFISHINGFLE2022
full_text_status: public
series: Discussion Paper Series / University of Heidelberg, Department of Economics
volume: 0712
place_of_pub: Heidelberg
pages: 17
citation:   Gómez-Cardona, Santiago ; Kammerer, Johannes ; Mrosso, Hillary  (2022) Fishing Fleet Selectivity in Lake Victoria's Nile Perch Fishery.  [Working paper]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/31341/7/Gomez-Cardona_Kammerer_Mrosso_2022_dp712.pdf