[Heterogeneity and polymorphism of functionally specialized blood proteins of migratory fish based on the example of the North Caspian population of Russian sturgeons during the sea and river periods of life. 2. Hemoglobins].

We carried out comparative studies of the heterogeneity and polymorphism of the most important functionally specialized blood proteins, hemoglobins. The fractional composition of hemoglobin proved to be identical during the sea and river periods of life for all main parameters (number of components, relative mobility, and protein content of each component). This puts the Russian sturgeon in a special position with reference to migratory teleostean fish, specifically salmonids, in which the specific weight of the protein of "slow" and "fast" hemoglobins undergoes changes upon change of the habitat.

[Heterogeneity and polymorphism of functionally specialized blood proteins in migratory fish: case study of the North Caspian population of the Russian sturgeon during sea and river periods of life. 1. Albumins].

A comparative study of the levels of heterogeneity and polymorphism of albumins, the most important functionally specialized blood proteins, has been carried out. The albumin system of Russian sturgeon undergoes distinct changes while the fish change habitat during the spawning migration from sea to river. They are expressed as an increased level of heterogeneity, an increased content of serum albumins in fish during the river period of life as compared to the sea period, and an increased share of a slow component of albuminograms.