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The feeding behaviour of juvenile Atlantic salmon in relation to turbulent flow

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The feeding behaviour of juvenile Atlantic salmon Salmo salar in the Sainte‐Marguerite River, Quebec, Canada, varied with the characteristics of turbulent flow. Simulations indicated that juveniles would decrease their swimming costs during attacks by 19·8% in low and by 31·1% in high turbulent conditions by initiating movements in low‐speed flow events. The real swimming costs did not differ from the swimming costs estimated for a situation where fish initiate their movements at randomly selected flow velocities. The juvenile Atlantic salmon did not seem to prefer low‐speed flow events when initiating their movements. The proportion of time used for movements by fish decreased with an increase in the mean and thes.d. of the flow velocity.
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Keywords: Salmo salar; feeding motion; fish behaviour; juvenile Atlantic salmon; turbulent flow

Document Type: Regular Paper

Affiliations: 1: Département de sciences biologiques, Université de Montréal, C.P. 6128, Succursale ‘Centre ville’, Montréal, Québec, H3C 3J7, Canada, 2: Section de géographie, Université du Québec à Rimouski, 300, allée des Ursulines, Rimouski, Québec, G5L 3A1, Canada and 3: Département de géographie, Université de Montréal, C.P. 6128, Succursale ‘Centre ville’, Montréal, Québec, H3C 3J7, Canada

Publication date: 2005-01-01

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