Abstract
A wide range of the osmotic gradient created by plasma and tissue fluid proteins in relation to the capillary wall in redfins of the genus Tribolodon during an annual cycle was revealed. The maximum gradient values are close to those in mammals. The plasma protein distribution between the intraand extravascular body fluids depends on the annual cycle period in the particular season (spawning and feeding completion) and the barrier properties of the capillary wall (peritoneum, brain, and white muscles). Among the osmotic reflection coefficient values characterizing the barrier properties of the capillary wall, those corresponding to its absolute impermeability were not found. This strategy can be explained by the fact that fish have to sustain the fluctuations in the intravascular fluid volume and its rapid recovery after hypovolemia, as well as by the features of protein metabolism in fish.
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