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Calculation of biomass trend, exploitation rate, and surplus production from survey and catch data

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Abstract:

If survey data and historical catches are available, it is possible to estimate the history of surplus production from a fishery as long as the scalar between the survey and absolute biomass can be estimated. Alternative hypotheses about present stock size correspond to alternative hypotheses about the scalar, so that by specifying an estimate of the current stock size or exploitation rate, the entire trend of surplus production can be calculated. An example, using monkfish (Lophius americanus) in the eastern United States, is given that shows quite robust conclusions to alternative assumptions about current stock size, and the analysis suggests that the surplus production from monkfish has been the highest during the period of lowest stock size.

Lorsqu'il existe des données d'inventaire et des informations sur les récoltes commerciales du passé, il est possible d'estimer l'historique de la production excédentaire, à la condition que l'on puisse déterminer le scalaire entre l'inventaire et la biomasse absolue. Faire des hypothèses de rechange concernant la taille du stock actuel correspond à faire des hypothèses sur le scalaire, si bien qu'en spécifiant une estimation de la taille du stock actuel ou de son taux d'exploitation, on peut calculer l'entière tendance de la production excédentaire. Un exemple basé sur la pêche commerciale de la Baudroie d'Amérique (Lophius americanus) de la côte est des États-Unis montre qu'on peut obtenir des conclusions très robustes pour des hypothèses diverses au sujet de l'importance de la taille du stock actuel. L'analyse laisse croire que la production excédentaire chez la baudroie a été maximale durant les périodes où la taille du stock a été le plus faible.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: March 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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