Genetic structure of two Turkish brown trout populations

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Abstract
The genetic structure of two brown trout Salmo trutta populations living in Lake Abant in Bolu and Üzüm River in Antalya was determined by examining 15 enzyme coding loci (AAT, ADH, LDH, MDH, MEP, GPI, PGM and SOD) using starch gel electrophoresis. Population specific mobilities were observed for the fixed alleles of LDH‐B2, mMEP‐2 and SOD‐1 loci. Polymorphisms in sAA T‐4, GPI‐B2 loci were observed within the populations. Average heterozygosity of Abant and Antalya populations was 0.0358 and 0.0224 respectively. For LDH‐C which is the post glaciation marker locus, the ancestral allele *105 was found to be fixed in both of the populations. Nei's genetic distance between the two populations was 0.2507 which is the level of genetic distance often found between different species. This difference seems to be due to the presence of unique alleles in the LDH‐B2, mMEP‐2 and SOD‐1 loci of the Abant population, indicating that the conservation of the Abant population and its heterozygosity is of prime importance.