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The evaluation of reference points and stock productivity in the context of alternative indices of stock reproductive potential

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Abstract:

In this study, we explore the impact of four alternative indices of reproductive potential (RP) on perceptions of population productivity for eight fish populations across the North Atlantic. The four indices of RP included increasing biological complexity, adding variation in maturation, sex ratio, and fecundity. Perceptions of stock productivity were greatly affected by the choice of index of RP. Population status relative to reference points, RP per recruit, and projections of population size all varied when alternative indices of RP were used. There was no consistency in which index of RP gave the highest or lowest estimate of population productivity, but rather, this varied depending on how much variation there was in the reproductive biology of the population and the age composition. Estimates of sustainable harvest levels and recovery time for depleted populations can vary greatly depending on the index of RP.

Nous explorons dans notre étude les effets de quatre indices de rechange du potentiel reproductif (RP) sur la perception de la productivité de la population chez huit populations de poissons provenant de l’Atlantique Nord. Les quatre indices de RP comprennent l’accroissement de la complexité biologique, l’addition de variation dans la maturation, la proportion des sexes et la fécondité. Le choix d’indice de RP affecte considérablement la perception de la productivité des stocks. Le statut de la population en fonction des points de référence, le RP par recrue et les projections de la taille de la population varient tous en fonction de l’indice RP retenu. Il n’y a pas de cohérence en ce qui a trait à quel indice donne l’estimation la plus élevée ou la plus basse de la productivité de la population, mais il y a plutôt des résultats différents selon l’importance de la variation dans la biologie de la reproduction et la composition en âge de la population. Les estimations des niveaux admissibles de récolte et du temps nécessaire au rétablissement des populations épuisées peuvent varier considérablement selon l’indice de RP utilisé.

Document Type: Research Article

Publication date: March 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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