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populations méditerranéennes

Aquatic Living Resources (1)

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Introgression between introduced domesticated strains and mediterranean native populations of brown trout (Salmo trutta L.)
Anne Barbat-Leterrier, René Guyomard, Francine Krieg
Journal:

Aquatic Living Resources / Volume 2 / Issue 4 / October 1989

Published online by Cambridge University Press:

15 October 1989, pp. 215-223

Print publication:

October 1989
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Introgression between introduced domesticated stocks and natural populations of brown trout was investigated by protein electrophoresis in three Mediterranean rivers. From each river, one undisturbed site and one, closely located, yearly stocked site were sampled. Comparison of the electrophoretic variation observed in samples from the undisturbed sites with that in the introduced hatchery strains revealed several specifically "domestic" variants. The genetic control of these variants was demonstrated by breeding experiments. The samples collected from the stocked sites showed introgression rates ranging from approximately 0 to 40%. The genotype frequencies observed in these samples suggested that no reproductive barrier exists between introduced and native stocks and that they form random mating populations.