Premières observations sur la truite (Salmo trutta L.) dans le Redon, un petit affluent-frayère du lac Léman

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Abstract
The spawning of brown trout (Salmo trutta L.) was studied during three successive winter bwtween the beginning of November and mid-January, in a small tributary of lake Leman. The survey was realized by using two complementary techniques: electrofishing and the counting of redds. The spawning activity is compared between sedentary and migrating trouts. The study describes the characteristics of sedentary trouts just before the spawning season and the one of migrating trout spawners. The movements of juveniles are briefly studied.

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