Le franchissement d'obstacles par les salmonidés migrateurs adultes. Analyse du comportement de saut pour un meilleur aménagement

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Abstract
The leaping behaviour of migratory salmonids has been studied at two small dams ( < 2 m) on the River Blavet [France]. A very small proportion (< 9%) of the total activity leads the fish to pass over the dams. For each gate, a successful jump can be only observed when a strong attractive current, a deep pool and an open gate are combined. Even when the gates are closed, the water leaks lead up to 50% of unsuccessful attempts. A reduction to 25% was obtained by plugging the leaks. The discussion of the results shows that a simple management of these kinds of dams can improve their clearing by adult migratory salmonids.

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