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Effect of physical stress on the osmoregulatory capacity of juvenile chum salmon Oncorhynchus keta in fisheries

Effect of physical stress on the osmoregulatory capacity of juvenile chum salmon Oncorhynchus keta in fisheries

Voprosy Ichtiologii 32(3): 133-139

ISSN/ISBN: 0042-8752

The effect of physical training of juvenile chum salmons on the development of their osmoregulatory system was studied, using different flow velocities in circular reservoirs. The experiments were carried out at the water temperature of 1.6-2 and 6-8 degree C. The functional tolerance of the juveniles for hypertonic environment was assessed by survival and capability of maintaining electrolyte balance after rapid transfer from freshwater into seawater. It was found that in an hyperosmotic environment, the survival of the fish increased, as did the efficiency of the stabilization of water-salt metabolism. Increased temperature combined with physical training facilitates adaptation to new salinity during the downstream migration of the fish.

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