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¹ Department of Animal Physiology and Biochemistry, Moscow representative office A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS Leninsky ave 38, 119991, Moscow, Russian Federation DOI : 10.4194/1303-2712-v21_3_03 Viewed : 2331 - Downloaded : 1690 Hemolymph cellular composition, morphology and functional properties of the Pacific oyster (Crassostrea gigas) hemocytes were studied. Three hemocyte types (agranulocytes, hyalinocytes and granulocytes) were described in hemolymph. The morphology of each type was characterized by light microscopy and flow cytometry. Agranular cells (agranulocytes and hyalinocytes) were the dominant type of cells in hemolymph; their number was 86.7±2.7% of total cell count. Under hypoxia the number of agranulocytes increased (37.4% for control group versus 95.3% for hypoxic probes), whereas granulocyte and hyalinocyte number decreased up to 3.9% and 0.7% in hypoxic specimens respectively. The spontaneous ROS production decreased in each hemocyte type after exposure to hypoxia. Low dissolved oxygen did not influence hemocyte proliferation and mortality level. Keywords : Crassostrea gigas, Hypoxia, Hemocytes