We studied blood serum albumins in European ( Acipenser ruthenus L.) and Siberian ( A. ruthenus marsiglii Brandt) sterlet using disk electrophoresis in polyacrylamide gel. The albumins were shown to be controlled by three codominant alleles of a single locus ( ALB * a, b, c ). In European sterlet, all six theoretically possible genotypes were described, one of which ( ALB * c / c ) occurred extremely rarely (one individual). Siberian sterlet was found to be monomorphic for albumins: all fish examined had the ALB * a / a genotype. There was no correlation between albumin patterns and fish fatness. In a number of samples from the Volga River basin, spatial and temporal differentiation was found and analyzed. The results suggest that construction of hydroelectric stations may provoke massive and prolonged sterlet migrations. ANIMAL GENETICS

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This study investigates muscle proteins in Russian (Acipenser gueldensiaedtii Brandt), Siberian (Acipenser baerii Brandt), and Amur (Acipenser schrenckii Brandt) sturgeons using the method of polyacryl amide gel electrophoresis. A group of fractions, which is presumably the product of a polyallelic duplicated MY 1* locus, is recorded among the general pool of proteins. Data from densitometric analysis makes it pos sible to put forward a hypothesis about an eight gene determination of this system of proteins. The highest heterogeneity and polymorphism was revealed in the Russian sturgeon. Analysis of the genotype distribution in samples of the studied species allowed us to make an assumption that the genetic structure of spawning sturgeon stocks is significantly metamorphosed under the influence of anthropogenic and natural factors.