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The costs of habitat utilization of wild, farmed, and domesticated juvenile Atlantic salmon (Salmo salar)

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Abstract:

We compared morphometry and total swimming costs of wild, farmed (first-generation hatchery progeny of wild progenitors) and domesticated (seventh-generation progeny of the Norwegian aquaculture strain) juvenile Atlantic salmon (Salmo salar). Respirometry experiments were performed to assess total swimming costs of fish ranging in size from 4.0 to 16.1 g wet mass at a water temperature of 15 °C. Fish were subjected to flow conditions of low and high turbulence. Total swimming costs increased significantly with intensity of turbulence and were, on average, 1.4 times higher at high than at low turbulence. Total swimming costs were 2.4- to 4.0-fold higher than predicted by forced swimming models developed under conditions that minimize flow heterogeneity. Total swimming costs of wild and farmed fish were not statistically different (average difference = 6.7%). Hence, swimming costs models developed using farmed fish may be used to estimate swimming costs of wild fish. However, domesticated fish had total swimming costs 12.0% to 29.2% higher than farmed or wild fish. This may be related to domesticated fish having deeper bodies and smaller fins.

Nous avons comparé la morphométrie et les coûts énergétiques totaux de nage des juvéniles du saumon atlantique (Salmo salar) sauvages, piscicoles (première génération en pisciculture issue de géniteurs sauvages) et domestiques (septième génération en pisciculture issue de la souche d'aquaculture norvégienne). Les expériences respirométriques ont été réalisé afin d'estimer les coûts énergétiques totaux de poissons de 4,0 à 16,1 g à une température de 15 °C. Les poissons étaient soumis à une faible et une forte condition turbulente de l'écoulement. Les coûts énergétiques totaux de nage augmentaient significativement avec l'intensité turbulente; ils étaient en moyenne 1,4 fois plus élevés à forte turbulence qu'à faible turbulence. Les coûts énergétiques totaux de nage étaient de 2,4 à 4,0 fois plus élevés que ceux prédits par les modèles de nage forcée. Les coûts énergétiques totaux des poissons sauvages et piscicoles n'étaient pas significativement différents (différence moyenne = 6,7 %). Ainsi, les modèles de coûts énergétiques de nage développés avec les poissons piscicoles peuvent être utilisés afin d'estimer les coûts énergétiques des poissons sauvages. Cependant, les poissons domestiques avaient des coûts énergétiques totaux de 12.0 % à 29.2 % plus élevés que les poissons piscicoles ou sauvages. Ceci pourrait être relié au fait que les poissons domestiques avaient un corps plus haut et des nageoires plus petites.

Document Type: Research Article

Publication date: December 1, 2004

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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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