[Analysis of nucleotide sequences of cytochrome C oxidase I (CO1) gene of mtDNA of Arctic Liopsetta glacialis and striped Liopsetta pinnifasciata flounder (Pleuronectidae) of the Sea of Okhotsk].

The first data on nucleotide sequences of cytochrome C oxidase I (CO1) gene of Arctic and striped flounders of the Sea of Okhotsk are analyzed. Nucleotide diversity of CO1 gene for 10 individuals of arctic flounder (π = 0,00370) is slightly less than that for 28 individuals of a striped flounder (π = 0,00446), caught in the Taui Lip, the Sea of Okhotsk. The size of the disparity index found on variability of nucleotides at individuals of a polar flounder indicates not selective nature of replacements, whereas at individuals of a striped flounder about a third of replacements is selective. The size of nucleotide distinctions between individuals arctic and striped flounders confirms the specific status of these fishes.

[On genetic differentiation of the yellowfin sole Limanda aspera from Taui Bay, the Sea of Okhotsk].

The population-genetic structure of yellowfin sole inhabiting in northern part of the Sea of Okhotsk has been investigated. Genetic heterogeneity of samples, collected in geographically remote areas of Taui Bay was found. The value of genetic differentiation GST = 2.39% in the investigated samples is a little less than in those of the Bering Sea (G(ST) = 4.25%, Grant et al., 1983).

[Genetic monitoring of pink salmon Oncorhynchus gorbuscha populations of northern coast of the Okhotsk Sea].

Results of genetic monitoring of pink salmon populations breeding in the rivers Taui Bay, Sea of Okhotsk (1993-2004) are analyzed. Statistically significant heterogeneity of samples identified according to gene frequencies are found out only for pink salmon generations of even years. Genetic differentiation of the samples of even years (G(ST) = 1,39 +/- 0,41) is higher than that of odd years (G(ST) = 0,74 +/- 0,09). At the same time for the parameter of genetic variability (heterozygosity) the regularity is opposite (0,0726 +/- 0,02564 vs. 0,08760 +/- 0,01950). Hence, at a lower heterozygosity the samplings of even years are characterized by higher genetic differences than the samplings of odd years. Besides that the interpopulation part in the general size of genetic variety is always practically less than both within-year and interannual that causes a low level of interpopulation genetic distinctions. Cluster analysis has found out that the most part of the samples of 2001-2004 are united separately from the samples collected up to 2000. In our opinion the reason is the change of the dominant generation on number and the changes of gene frequencies accompanying it.

[Analysis of morphological differencies of the homo- and heterozygous males and females of pink salmon Oncorhynchus gorbuscha (Walbaum) in the population of the river Ola (the northern coast of the Sea of Okhotsk)].

The distinctions of the average values and dispersions of the length and the weight of a body in homo-and heterozygotic groupings of five loci (G3PDH*, sMDH-B 1,2*, PGDH*, FDHG* and PGM-2*) were analysed in a population of pink salmon of the river Ola. It was shown that the character of correlation between genotypical structure and morphological trait is not obligatory and identical for each gene. In our opinion polygenic complexes and not separate genes determine the morphological traits.

[Genetic diversity in a small population of sockeye salmon, Oncorhynchus nerka (Walbaum) from the Ola river (northern coast of the Okhotsk sea)]. / Geneticheskaia izmenchivost' malochislennoi populiatsii nerki Oncorhynchus nerka (Walbaum) p. ola (severnoe poberezh'e otkhotskogo moria).

The genetic structure of a small sockeye salmon population from the Ola River (Tauyskaya Inlet, the Okhotsk Sea) was shown to exhibit high heterogeneity. Significant differences of LDH-B2* and ALAT-2* gene frequencies were detected not only among samples within the spawner and juvenile groups but also between spawners and juveniles as a whole. The average heterozygosity of sockeye salmon from the Ola River was considerably lower than the corresponding values for other Asian populations. The Ola sockeye salmon is genetically similar to the population from the Pakhach River of the northwestern Kamchatka Peninsula but different from other Kamchatka populations and the Okhota River population. A hypothesis explaining the genetic differentiation of Asian sockeye populations is advanced.

[Genetic changes in pink salmon Oncorhynchus gorbuscha Walbaum during acclimatization in the White sea basin]. / Geneticheskie izmeneniia u gorbushi Oncorhynchus gorbusha (Walbaum) v khode akklimatizatsii v basseine Belogo moria.

Genetic parameters of pink salmon introduced into the White Sea basin in 1985 and 1998 were compared to the corresponding parameters of the donor population from the Ola River (Magadan oblast). The detected genetic differences indicate that colonization of a new area is accompanied by impoverishment of the gene pool of the native population. This effect was particularly marked in the odd-year line of pink salmon introduced in 1985. The probable causes of these genetic changes are discussed.

[Analysis of correlation between discrete genotype characteristics and quantitative morphological traits in Oncorhynchus nerka (Walbaum) from the Kamchatka river]. / Analiz sviazi mezhdu diskretnymi genotipicheskimi parametrami i kolichestvennymi morfologicheskimi priznakami u nerki Oncorhynchus nerka (Walbaum) r.Kamchatka.

Correlation of m, a, d quantitative parameters with a genotypic composition of LDH-B2* and PGM-2* loci in spawned population of the sockeye salmon from the Kamchatka river has been analysed with the Fisher-Mather method (Bezrukov, 1994). Different values of m, a, d parameters were revealed for morphological characters depending on: 1) genotypic composition on each locus, 2) sexual composition of the population. The simple influence of heterozygosity was found on one locus for females and males separately.