RESTRICTION-ENDONUCLEASE ANALYSIS OF MITO CHONDRIAL-DNA OF THE 2 FORMS OF LENOK BRACHYMYSTAX-LENOK (PALL) AND TAIMEN-HUCHO-TAIMEN (PALL)

Mitochondrial DNA analysis of the blunt-snouted and sharp-snouted leno ks of the sympatric zone (Amur basin) and blunt-snouted lenok of two a llopartic populations (North-Eastern and Southern Primorye) as well as taimen was carried out with 12 restriction endonucleases. Nine mtDNA clones were resolved: in fours for each form of lenok and one for taim en. Estimation of the average percent of nucleotide differences of mtD NA (pi) obtained for one sample of sharp-snouted lenok was 0.51 + 0.17 . For blunt-snouted lenok the similar value of pi(0.52 + 0.21) was rea ched by comparison of three geographically farthest populations (divid ed by approx. 1000 km) with each other. Two forms of lenok showed esse ntial genetic differences - pi = 1.86 + 0.56. Estimation of pi between lenoks and taimen amounts to 3.25 + 0.89. Phylogeny of lenok and taim en and relationships between two forms of lenok on the East of the are a are discussed.