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Gillnet selectivity and its relationship with body shape for eight freshwater fish species

Knowledge of the size-selectivity of fishing gear types is crucial to fisheries management and ecology. The gillnet selectivity of most freshwater fish is poorly known. We caught 694 individuals of eight widely-distributed freshwater fish species (seven cyprinids and the pikeperch, Sander lucioperca) with multi-mesh gillnets in Spanish reservoirs. The SELECT method was applied to fit four different gillnet selectivity models (normal location, normal scale, lognormal, and gamma). The normal scale model (spread proportional to mesh size) had the best fit in four of the eight fish species. Predicted modal lengths for the best fit models are given to describe gillnet selectivity for the eight fish species. Significant variation in the selectivity parameters was explained by simple shape descriptors such as percent girth or percent depth, suggesting that these shape descriptors might be used as a preliminary tool to describe gillnet selectivity for other fish species

This study was financed by the Catalan Water Agency (ACA), Government of Catalonia (CT02003134) and the Spanish Ministry of Science and Technology (REN2003–00477)

© Journal of Applied Ichthyology, 2007, vol. 23, núm. 6, p. 654-660

Wiley

Author: Carol Bruguera, Joaquim
García-Berthou, Emili
Date: 2007
Abstract: Knowledge of the size-selectivity of fishing gear types is crucial to fisheries management and ecology. The gillnet selectivity of most freshwater fish is poorly known. We caught 694 individuals of eight widely-distributed freshwater fish species (seven cyprinids and the pikeperch, Sander lucioperca) with multi-mesh gillnets in Spanish reservoirs. The SELECT method was applied to fit four different gillnet selectivity models (normal location, normal scale, lognormal, and gamma). The normal scale model (spread proportional to mesh size) had the best fit in four of the eight fish species. Predicted modal lengths for the best fit models are given to describe gillnet selectivity for the eight fish species. Significant variation in the selectivity parameters was explained by simple shape descriptors such as percent girth or percent depth, suggesting that these shape descriptors might be used as a preliminary tool to describe gillnet selectivity for other fish species
This study was financed by the Catalan Water Agency (ACA), Government of Catalonia (CT02003134) and the Spanish Ministry of Science and Technology (REN2003–00477)
Format: application/pdf
ISSN: 0175-8659 (versió paper)
1439-0426 (versió electrònica)
Document access: http://hdl.handle.net/10256/12409
Language: eng
Publisher: Wiley
Collection: MICYT/PN 2003-2006/REN2003-00477
Reproducció digital del document publicat a: http://dx.doi.org/10.1111/j.1439-0426.2007.00871.x
Articles publicats (D-CCAA)
Is part of: © Journal of Applied Ichthyology, 2007, vol. 23, núm. 6, p. 654-660
Rights: Tots els drets reservats
Subject: Peixos d’aigua dolça -- Pesca
Freshwater fishes -- Fishing
Title: Gillnet selectivity and its relationship with body shape for eight freshwater fish species
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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