[Discrete phenotypical variability of electrophoretic specters of one of myogen systems in the Acipenseridae family].

Analysis of electrophoregrams of water-soluble proteins of white skeletal muscle of 10 fish species belonging to three genera of the Acipenseridae family has allowed revealing an earlier not described system that can serve as a biochemical marker. This protein system represents a set of five fractions (A, B, C, D, E). A part of the studied species is monomorphous for one of these fractions (sterlet, starred sturgeon, great sturgeon, and big shovelnose had phenotype A, barbel sturgeon--phenotype C, great Siberian sturgeon--phenotype D). In all individuals of the Amur sturgeon the identical three-component specter (phenotype ACE) was revealed. In the Sakhalin, Siberian, and Russian sturgeons a clearly expressed polymorphism was observed. Among the studied species the Russian sturgeon was characterized by the highest degree of heterogeneity and polymorphism. In the studied sample of this species all five protein variants are found, whereas in other species--only a part of this set.