Genetic differentiation between freshwater resident and anadromous brown trout, Salmo trutta, within watercourses

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Abstract
Freshwater resident and anadromous life history forms of brown trout, Salmo trutta L., sampled from each of three watercourses were analysed for biochemical genetic variation. Ten enzyme systems encoded by a putative 30 loci were analysed. Significant genetic differences were found between the two life history forms in all three watercourses. Further, significant genetic differences were also found between the three anadromous populations analysed, although two of them are separated by a distance along the shore line by less than 2 km. The findings focus on the need to reconsider the conservation and management practice of wild and hatchery‐reared stocks.

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