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Reduced recruitment performance in natural populations of anadromous salmonids associated with hatchery-reared fish

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We found a negative relationship between the reproductive performance in natural, anadromous populations of steelhead trout (Oncorhynchus mykiss), coho salmon (O. kisutch), and Chinook salmon (O. tshawytscha), and the proportion of hatchery fish in the spawning population. We used intrinsic productivity as estimated from fitting a variety of recruitment models to abundance data for each population as our indicator of reproductive performance. The magnitude of this negative relationship is such that we predict the recruitment performance for a population composed entirely of hatchery fish would be 0.128 of that for a population composed entirely of wild fish. The effect of hatchery fish on reproductive performance was the same among all three species. Further, the impact of hatchery fish from “wild type” hatchery broodstocks was no less adverse than hatchery fish from traditional, domesticated broodstocks. We also found no support for the hypothesis that a population's reproductive performance was affected by the length of exposure to hatchery fish. In most cases, measures that minimize the interactions between wild and hatchery fish will be the best long-term conservation strategy for wild populations.

Nous observons une relation négative entre la performance reproductive de populations naturelles de truites arc-en-ciel anadromes (Oncorhynchus mykiss), de saumons coho (O. kisutch) et de saumons chinook (O. tshawytscha) et la proportion de poissons de pisciculture dans les populations de reproducteurs. Nous utilisons la productivité intrinsèque estimée en ajustant une variété de modèles de recrutement aux données d'abondance de chaque population comme indice de performance reproductive. L'importance de cette relation négative est telle que nous prédisons que la performance du recrutement dans une population composée entièrement de poissons de pisciculture serait de 0,128 celle d'une population composée totalement de poissons sauvages. L'effet des poissons de pisciculture est le même chez les trois espèces. De plus, l'impact des poissons de pisciculture provenant de stocks reproducteurs de pisciculture de « type sauvage » n'est pas moins négatif que celui des poissons de pisciculture de stocks reproducteurs traditionnels et domestiqués. Nous ne trouvons aucun appui à l'hypothèse qui veut que la performance reproductive d'une population soit affectée par la durée de son exposition aux poissons de pisciculture. Dans la plupart des cas, les mesures qui minimisent les interactions entre les poissons sauvages et les poissons de pisciculture constituent la meilleure stratégie de conservation à long terme pour les populations sauvages.

Document Type: Research Article

Publication date: 2011-03-01

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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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