Optimal in-season management of pink salmon (Oncorhynchus gorbuscha) given uncertain run sizes and seasonal changes in economic value

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Abstract:

In this study, we developed a stochastic simulation model that simulates the in-season abundance dynamics of pink salmon (Oncorhynchus gorbuscha) stocks, the fleet dynamics, and management of purse seine fisheries in the northern Southeast Alaska inside waters. Uncertainties in annual stock size and run timing, fleet dynamics, and both preseason and in-season forecasts were accounted for explicitly in this simulation. The simulation model was applied to evaluating four kinds of management strategies with different fishing opening schedules and decision rules. The ranking of the management strategies is apparently determined by the evaluation criteria applied. When only flesh quality is concerned, both the current and a more aggressive strategy, as long as they adapted themselves to the run strength, were able to provide higher quality fish without compromising the escapement objectives. When the value of the eggs is also a concern, the management strategies that have more intensive late opening schedules might be preferable. When both flesh quality and the value of eggs are considered, the ranking of the management strategies depends on the timing of the stocks.

On trouvera ici un modèle de simulation stochastique qui représente la dynamique de l'abondance saisonnière des stocks de saumons roses (Oncorhynchus gorbuscha), la dynamique de la flotte de pêche et la gestion de la pêche à la senne à poche dans les eaux du passage intérieur de la région nord du sud-est de l'Alaska. La simulation tient compte de façon explicite des incertitudes concernant la taille du stock annuel et du calendrier de la montaison, de la dynamique de la flotte et des prévisions faites avant et pendant la saison de la pêche. Le modèle a été utilisé pour évaluer quatre types de stratégies de gestion comprenant des calendriers d'ouverture de la pêche différents et des règles de décision particulières. Le classement des stratégies de gestion est, semble-t-il, relié aux critères d'évaluation. Quand on se préoccupe simplement de la qualité de la chair, tant la stratégie actuelle qu'une stratégie plus agressive peuvent fournir des poissons de haute qualité sans mettre en péril les objectifs de l'échappement, à condition que les stratégies soient adaptées à la force de la montaison. Si l'on s'intéresse aussi à la valeur des oeufs, les stratégies de gestion qui comportent des calendriers plus intensifs à ouverture tardive sont probablement préférables. Si l'on tient compte à la fois de la qualité de la chair et de la valeur des oeufs, le classement des stratégies de gestion varie selon la phénologie des stocks.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: October 1, 2002

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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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