Intra- and interspecific features of the composition and structure of blood cells of coregonid fishes from the East-Siberian region
Yakhnenko, V.; Klimenkov, I.; Mamontov, A.; Yakhnenko, M.
Cell composition of peripheral blood and blood-forming organs were similar between coregonid fishes from Lake Baikal (omul, pidschian, lacustrine whitefish, hybrids omul x pidschian F1 and F2), the Baunt Lakes (autumn- and spring-spawning pidschian, whitefish, least cisco), the Lena River (pidschian, valek, tugun), Lake Leprindo (pidschian), and the Angara River (peled). Peripheral blood consisted of erythrocytes (up to 90%) and their immature forms, leukocytes and thrombocytes. Leukocytes were represented by agranulocytes (lymphocytes from 40 to 90%, monocytes, pseudogranulocytes or polymorphonuclear leucocytes) and granulocytes (neutrophils, eosinophils). Basophil granulocytes were not found in these coregonids. Baikal whitefishes and omul had few granulocytes in their peripheral blood, whereas the predecessors of these cells were present in blood-forming organs. We suggest that the mechanisms of immune protection defined by granular leukocytes were not activated in endemic coregonids from Lake Baikal. The cytometric, red and white blood parameters within ecological and morphological types of coregonid fishes from Lake Baikal differed mainly in the size of the cells and nuclei of mature erythrocytes.