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Quantification of species selectivity by using separating devices at different locations in two whitefish demersal trawls

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Abstract:

This paper presents a quantitative approach to the study of fish behaviour in trawls with the aim of maintaining the catching efficiency of target species and reducing discards of unwanted bycatch. Differences in vertical distributions of species during passage through a trawl are used to sort the catch into separate compartments prior to size selection. It is demonstrated that behavioural differences may be utilized in separating species prior to size selection. Comparisons indicate that these patterns are consistent over replicate trials. Unlike cod (Gadus morhua), haddock (Melanogrammus aeglefinus), saithe (Pollachius virens), and whiting (Merlangius merlangus) do not change their vertical preference longitudinally in the trawl.

Ce travail présente une approche quantitative à l’étude du comportement des poissons dans les chaluts avec pour objectif de maintenir l’efficacité de la capture d’espèces cibles et réduire les rejets de captures accessoires indésirabes. Les différences dans la distribution verticale des espéces au cours de leur passage à travers le chalut sont utilisées pour trier les captures dans des compartiments séparés, avant la sélection des tailles. Nous démontrons que les différences de comportement peuvent servir pour la séparation des espèces avant la sélection des tailles. Les comparaisons indiquent que ces modèles sont cohérents lors d’essais répétés. Contrairement à la morue (Gadus morhua), les préférences verticales de l’aiglefin (Melanogrammus aeglefinus), de la goberge (Pollachius virens) et du merlan (Merlangius merlangus) ne changent pas en fonction de l’orientation longitudinale du chalut.

Document Type: Research Article

Publication date: December 1, 2009

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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