[A comparison of the spawning migration and genetic and biological parameters of stellate sturgeon from the Volga population in 1985 and 1996].

The dynamics of changes in several genetic and biological parameters of the Volga stellate sturgeon during the spawning runs of 1985 and 1996 were studied by electrophoresis and morphometry and compared. The dynamics of changes in genetic diversity of the spawners running spawners is repeated in many respects every 11 years, suggesting that the intrapopulation diversity is maintained in time. The among-sample diversity of late spring stellate sturgeon, whose spawners spawners are used in hatchery, decreased twofold.

[Variation in morphometric and genetic characteristics of stellate sturgeon juveniles raised at different densities].

Genetic and size/weight characteristics of stellate sturgeon juveniles were examined under standard and twice lower than standard densities. Viability, growth rate, and variability of juveniles were higher at standard density. Individuals with different genotypes exhibited higher viability and faster growth at different densities, which was particularly pronounced in case of the PGM1 locus.

[Patterns in the body's immune response to administration of El Tor vibrio cholera toxin to experimental animals].

A study was made of some regularities attending the mechanisms of antibody production in the organism of experimental animals after the administration of El Tor cholera vibrio toxin. As revealed, the indices of the immune response depended on the chosen model, the method of its determination, the method of administration and the amount of the toxin administered. Dynamics of the primary and secondary responses of the immunocompetent cells of mouse spleen was determined.