Effect of activity, salinity, and temperature on plasma concentrations of rainbow trout

Abstract

The plasma of rainbow trout was essentially isosmotic with the medium in 7.5‰ salinity. Osmotic concentrations of plasma were higher by 5% to 12% in an exercised fish in all salinities at both temperatures when compared to those of a resting fish. However, the chloride concentrations of exercised and resting fishes were not significantly different. Both osmotic and chloride concentrations of plasma were higher at 5 °C than those at 15 °C.