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The effects of domestication on the relative vulnerability of hatchery and wild origin spring Chinook salmon (Oncorhynchus tshawytscha) to predation

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We tested whether one generation of state-of-the-art hatchery culture influenced the vulnerability of Chinook salmon (Oncorhynchus tshawytscha) fry to predators. Size-matched hatchery and wild origin spring Chinook salmon fry were exposed to rainbow trout (Oncorhynchus mykiss) and torrent sculpin (Cottus rhotheus) predators in 10.8 m3 net pens. The hatchery origin fry were the offspring of first generation hatchery-reared broodstock, and the wild origin fry had no history of hatchery culture; both originated from the same stock. Wild origin fry were found to have a 2.2% (p = 0.016) survival advantage over hatchery origin fry during 2 years of predation challenges. The most important findings of this study are (i) domestication can affect the susceptibility to predators after only one generation of state-of-the-art hatchery culture practices, and (ii) the domestication effect was very small.

Nous vérifions si un élevage pendant une génération dans une pisciculture de pointe influence la vulnérabilité des alevins de saumon chinook (Oncorhynchus tshawytscha) aux prédateurs. Nous avons exposé des alevins de saumons chinook du printemps, de pisciculture et d'origine sauvage, appariés en fonction de la taille, à des prédateurs, des truites arc-en-ciel (Oncorhynchus mykiss) et des chabots de torrent (Cottus rhotheus), dans des enclos de filet de 10,8 m3. Les alevins de pisciculture étaient les rejetons d'un stock reproducteur de première génération d'élevage en pisciculture et les alevins sauvages n'avaient aucun antécédent d'élevage en pisciculture; les deux groupes provenaient d'un même stock. Les alevins d'origine sauvage ont eu un avantage de survie de 2,2 % (p = 0,016) sur les alevins d'élevage au cours des deux années de confrontation avec les prédateurs. Les résultats les plus importants de notre recherche sont que (i) la domestication affecte la vulnérabilité aux prédateurs après une seule génération d'élevage dans des conditions de pisciculture de pointe et (ii) l'effet de la domestication est très petit.

[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2007

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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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