[Contents of monovalent cations and ATP in erythrocytes of marine fishes in experimental hypoxia].

Coupling of membrane and metabolic functions in nuclear erythrocytes was investigated under experimental hypoxia conditions in fishes (Liza aurata, Scorpaena porcus) with different tolerance to oxygen deficiency. It was shown, that resistant to hypoxia Scorpaena porcus keeps in erythrocytes transmembrane gradients of K+ and Na+ and cellular concentration ATP under 15% of oxygen saturation of sea water. It was connected with the decrease in Na+, K+ -ATPase and hexokinase activity. The reaction to oxygen deficiency was opposite in sensitive to hypoxia Liza aurata erythrocytes. A decrease in ionic gradients and concentration of ATP in red blood cells was observed while the activity of Na+, K+ -ATPase and hexokinase was high. The reasons of the differences obtained are discussed.