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Electrophoretic variation in 6 populations of brown trout salmo trutta

, : Electrophoretic variation in 6 populations of brown trout salmo trutta. Canadian Journal of Genetics & Cytology 25(4): 403-413

Starch gel electrophoretic studies of 16 enzymes and proteins [aspartate aminotransferase, alcohol dehydrogenase, creatine kinase, glycerol-3-phosphate dehydrogenase, isocitrate dehydrogenase, lactate dehydrogenase, malate dehydrogenase, malic enzyme, para-albumin, phosphoglucose isomerase, phosphoglucomutase, phosphomannose isomerase, 6-phosphogluconate dehydrogenase, sorbitol dehydrogenase, superoxide dismutase, transferrin] encoded by 34 loci were performed on 6 brown trout populations. One new polymorphism is described at the Pmi-2 locus. Breeding data were analyzed for both single and joint segregation of 6 loci: Aat-1, Cpk-1, G3p-2, Mdh-2, Mdh-3 and Pmi-2. All the loci are shown to segregate in simple mendelian ratios and 1 nonrandom joint segregation was observed. The polymorphism level, heterozygosities and genetic distances were estimated and compared with those reported in other studies on brown trout and closely related salmonid species. The polymorphism level (25%) and average heterozygosity (9%) were high. Significant genetic distances were observed, but the average degree of differentiation between populations appeared to be small (9% of the total heterozygosity).

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