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Reproductive behavior and relative reproductive success of natural- and hatchery-origin Hood Canal summer chum salmon (Oncorhynchus keta)

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Estimates of the relative fitness of hatchery- and natural-origin salmon can help determine the value of hatchery stocks in contributing to recovery efforts. This study compared the adult to fry reproductive success of natural-origin summer chum salmon (Oncorhynchus keta) with that of first- to third-generation hatchery-origin salmon in an experiment that included four replicate breeding groups. Hatchery- and natural-origin chum salmon exhibited similar reproductive success. Hatchery- and natural-origin males obtained similar access to nesting females, and females of both types exhibited similar breeding behaviors and durations. Male body size was positively correlated with access to nesting females and reproductive success. The estimates of relative reproductive success (hatchery/natural = 0.83) in this study were similar to those in other studies of other anadromous salmonids in which the hatchery population was founded from the local natural population and much higher than those in studies that evaluated the lifetime relative reproductive success of nonlocal hatchery populations.

Des estimations de la fitness relative des saumons d’origine naturelle et de pisciculture peuvent aider à déterminer la valeur que représentent les stocks de pisciculture dans les efforts de récupération. Notre étude compare le succès reproductif de l’adulte à l’alevin chez des saumons kéta (Oncorhynchus keta) d’été d’origine naturelle à celui de saumons de pisciculture de première à troisième génération dans une expérience qui comporte deux séries de quatre groupes reproducteurs. Les saumons kéta d’origine naturelle et de pisciculture ont des succès reproductifs semblables. Les mâles de pisciculture et les mâles d’origine naturelle ont des accès semblables aux femelles au nid et les femelles des deux types ont des comportements reproducteurs et des durées de fraie semblables. Il y a une corrélation positive entre la taille corporelle du mâle et son accès aux femelles en nidification et son succès reproductif. Les estimations du succès reproductif relatif (pisciculture/origine naturelle = 0,83) dans notre étude sont semblables à celles d’autres études d’autres saumons anadromes dans lesquelles la population de pisciculture a été fondée à partir de la population naturelle locale et elles sont beaucoup plus élevées que celles d’études qui ont évalué le succès reproductif au cours de la vie de populations de pisciculture d’origine non locale.

Document Type: Research Article

Publication date: May 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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