Organ blood flow and vessels of microcirculatory bed in fish

Information on density of fish capillary network and its permeability, peculiarities of geometry, morphology, and ultrastructure of vessels of microcirculation bed—arterioles, venules, capillaries—is presented. A great attention is paid to vasomotor reactions and their participation in redistribution of blood. Nervous and humoral mechanisms of control of tone of the vessel smooth muscle wall and voluminous blood flow are considered. Effects of environmental factors on processes of microcirculation in fish are discussed.