Thermoresistance of Erythrocytes and Hemoglobin at Acclimation of the Rainbow Trout Salmo irideus

Changes of parameters of thermally induced hemolysis of erythrocytes and of thermal denaturation of hemoglobin were studied at acclimation of the rainbow trout Salmo irideus to seasonal changes of water temperature in the range of 0–20°C. A correlation was revealed between thermoresistance of erythrocytes, activation energy of thermal hemolysis, and water temperature variations, whereas thermostability of hemoglobin remained practically constant. The conclusion is made that seasonal changes of thermoresistance of erythrocytes are determined by rearrangements in membrane, which play adaptive role and are due to variations in lipid composition.