GENETIC-STRUCTURE OF 2 TURKISH BROWN TROUT POPULATIONS

The genetic structure of two brown trout Salmo trutta populations livi ng in Lake Abant in Bolu and Uzum River in Antalya was determined by e xamining 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. P olymorphisms in sAAT-4. GPI-B2 loci were observed within the populatio ns. Average heterozygosity of Abant and Antalya populations was 0.0358 and 0.0224 respectively. For LDH-C which is the post glaciation marke r locus, the ancestral allele 105 was found to be fixed in both of th e populations. Nei's genetic distance between the two populations was 0.2507 which is the level of genetic distance often found between diff erent species. This difference seems to be due to the presence of uniq ue alleles in the LDH-B2, mMEP-2 and SOD-1 loci of the Abant populatio n, indicating that the conservation of the Abant population and its he terozygosity is of prime importance. (C) 1995 The Fisheries Society of the British Isles