Blood composition of Siberian roach (Rutilus rutilus, L., 1758) (Cyprinidae) inhabiting Chivyrkuisky bay of lake Baikal

The article presents new data on the peripheral blood composition of Siberian roach (Rutilus rutilus (L., 1758)) inhabiting Chivyrkuisky Bay of Lake Baikal (2019-2020). We have differentiated cellular elements of the blood in roach along the line of erythropoietic, agranulo- (lymphocytes) and granulocytopoietic (neutrophils) series. Erythrocytes are the dominant group of blood cell count in the blood of roach, the hemoglobin level indicates good blood oxygenation. The most numerous cells among leukocytes are lymphocytes, followed by neutrophils at different stages of proliferation and differentiation. Cytomorphological analysis of fish blood has shown the absence of structural cellular abnormalities, which is a prognostic of normal hematopoiesis. The study of the erythrocyte and leukocyte composition allows us to draw a conclusion about the favorable immune status and good adaptive capabilities of the local population, and reflects the favorable environmental situation of this biocenosis in the summer period in the years under study.