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Individual-based yield-per-recruit analysis, with an application to the Atlantic sea scallop, Placopecten magellanicus

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Abstract:

There can be considerable variation in fishing mortality risk among individuals in a stock, especially for sedentary or sessile species. An individual-based per-recruit model is proposed that can systematically deal with variability in fishing mortality among recruits. These variations can alter the yield per recruit (YPR) and biomass per recruit (BPR) that would be predicted from conventional theory. Where the YPR curve is concave, standard theory will tend to overestimate YPR, whereas the opposite will be true where the YPR curve is convex. Additionally, variations in fishing mortality among individuals can create a mismatch between conventional metrics of mean fishing mortality and that required to properly apply standard per-recruit theory. The concept of "recruit-weighted" fishing mortality is introduced to deal with this problem. An application of the model to the Atlantic sea scallop, Placopecten magellanicus, is presented that demonstrates that standard per-recruit theory may often misrepresent true YPR and BPR.

Il peut y avoir une variation importante du risque de mortalité due à la pêche parmi les individus d'un même stock, particulièrement chez les espèces sédentaires ou sessiles. On trouvera ici une modélisation "par recrue", basée sur l'individu, qui permet de traiter de la variabilité de la mortalité due à la pêche chez les recrues. Ces variations peuvent affecter la prédiction du rendement et de la biomasse par recrue (BPR) par les théories habituelles. Lorsque la courbe de rendement par recrue (YPR) est concave, la théorie standard tendra à surestimer le rendement par recrue; elle le sous-estimera lorsque la courbe est convexe. De plus, les variations de la mortalité due à la pêche d'un individu à l'autre peuvent générer un désaccord entre les métriques conventionnelles de la mortalité moyenne due à la pêche et celles qui sont requises pour l'application correcte de la théorie standard "par recrue". L'introduction du concept d'une mortalité due à la pêche pondérée par recrue permet de résoudre ce problème. L'application du modèle au Pétoncle géant, Placopecten magellanicus, démontre que la théorie standard peut souvent fausser les véritables valeurs de rendement et de biomasse par recrue.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2001

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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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