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A model of total swimming costs in turbulent flow for juvenile Atlantic salmon (Salmo salar)

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Abstract:

Juvenile Atlantic salmon (Salmo salar) live in rivers characterized by highly turbulent flows. In these environments, flow turbulence is associated with a wide range of instantaneous flow velocities, which may affect the energetic costs of habitat utilization of juvenile Atlantic salmon. The purpose of our work was to develop a swimming costs model for juvenile Atlantic salmon that especially accounts for the effects of velocity fluctuations in turbulent environments. We estimated the total swimming costs of fish in a respirometer in which we produced five turbulent flow conditions, each characterized by a mean and a standard deviation of flow. Respirometry experiments were conducted at water temperatures of 10, 15, and 20 °C with fish ranging in size between 4.3 and 17.6 g at three mean flow velocities (18, 23, and 40 cm·s–1) and three standard deviations of flow velocity (5, 8, and 10 cm·s–1). Our results confirmed that total swimming costs increased with an increase of water temperature, body mass, mean flow velocity, and standard deviation of flow velocity (R2 = 0.93). Water temperature, body mass, mean flow velocity, and standard deviation of flow velocity contributed respectively 2%, 31%, 46%, and 14% to the explained variation in total swimming costs.

Les juvéniles du saumon atlantique (Salmo salar) vivent dans les rivières caractérisées par des écoulements fortement turbulents. Dans ces environnements, la turbulence de l'écoulement est associée à un vaste étendu des vitesses instantanées, ces dernières pourraient affecter les coûts énergétiques des juvéniles du saumon atlantique lors de l'utilisation de l'habitat. Le but de notre travail était de développer un modèle de coût de nage des juvéniles du saumon atlantique qui tient spécialement compte des effets des fluctuations de vitesse dans un environnement turbulent. Nous avons estimé les coûts totaux de nage de poisson dans un respiromètre dans lequel nous avons produit cinq conditions turbulentes, chacune caractérisée par une moyenne et un écart-type distincts de la vitesse de l'écoulement. Les expériences respirométriques ont été réalisées à 10, 15 et 20 °C en utilisant des poissons d'une taille variant de 4,3 à 17,6 g, à trois vitesses moyennes (18, 23 et 40 cm·s–1) et à trois écart-types de vitesse (5, 8 et 10 cm·s–1). Nos résultats confirment que les coûts totaux de nage augmentent avec une augmentation de la température de l'eau, de la masse corporelle, de la vitesse moyenne et de l'écart-type de vitesse (R2 = 0,93). La température de l'eau, la masse corporelle, la vitesse moyenne et l'écart-type de vitesse contribuent respectivement pour 2, 31, 46 et 14 % de la variation expliquée dans les coûts totaux de nage.

Document Type: Research Article

Publication date: 2005-05-01

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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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