Seasonal variations of functional properties of hemoglobin and ionic environment in the Freshwater fish: An example of bream, Abramis brama (Cyprinidae)

Abstract

The dynamics of hemoglobin affinity to oxygen, Bohr effect value, and concentrations of sodium, potassium, calcium and magnesium were studied in the bream, Abramis brama, erythrocytes of the Rybinsk reservoir during an annual cycle. The studied parameters were most variable during the fish reproductive period. On the basis of the original studies, as well as of some published data concerning physiological–biochemical parameters, it is suggested that the state of spawning is comparable to the state of stress. The relation between the seasonal dynamics of hemoglobin functional properties and the parameters of ionic environment is revealed.