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Simulations of random fishing behaviour as an independent validation for the effect of active targeting of greenlip abalone (Haliotis laevigata) aggregations

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Abstract:

Although active targeting of abalone aggregations is documented for various species, its impact on large aggregations is poorly understood. As large aggregations make the greatest contribution to reproductive success, yet are vulnerable to exploitation, it is important to understand how targeted fishing impacts aggregation structure. If observed postfishing patterns are equally likely to have occurred in response to more random, nontargeted fishing, then changes in aggregation patterns cannot be directly attributed to aggregation-based targeting behaviour. The effect of targeted fishing on greenlip abalone (Haliotis laevigata) aggregations was verified by simulating three different levels of "random" fishing behaviour to generate postfishing aggregation frequency distributions. Comparison of the output with postfishing survey distributions suggested that observed aggregation patterns could not have resulted from random search behaviour. The aggregation survey data can therefore be used as a valid basis on which to quantify both fishing behaviour in terms of aggregation-specific catch patterns and the response of aggregations to fishing.

Bien que le ciblage actif des regroupements d'ormeaux ait été étudié chez plusieurs espèces, on en connaît mal l'impact sur les grands regroupements. Puisque les grands regroupements contribuent majoritairement au succès de la reproduction et qu'ils sont vulnérables à l'exploitation, il est important de comprendre comment la pêche ciblée affecte la structure des regroupements. Si les patterns observés après la pêche peuvent vraisemblablement s'être formés en réaction à une pêche plus aléatoire et non ciblée, les changements dans les patterns de contagion ne peuvent s'expliquer directement par un comportement de ciblage basé sur la contagion. Nous avons vérifié les effets de la pêche ciblée sur les regroupements de l'ormeau Haliotis laevigata en simulant trois niveaux différents de pêche « aléatoire » dans le but de générer des distributions de fréquence des regroupements après la pêche. La comparaison des résultats des simulations et des répartitions inventoriées après la pêche montre que les patterns de contagion observés ne peuvent être générés par un comportement de recherche aléatoire. Les données d'inventaire sur la contagion peuvent donc servir de base valide pour quantifier, d'une part, le comportement de pêche en ce qui a trait aux patterns de capture spécifiques aux regroupements et, d'autre part, la réaction des regroupements à la pêche. [Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2004

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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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