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Effect of low temperature on sea water tolerance in rainbow trout salmo gairdneri


, : Effect of low temperature on sea water tolerance in rainbow trout salmo gairdneri. Aquaculture 72(3-4): 319-328

Fresh-water-acclimated rainbow trout, Salmo gairdneri (40-180 g), were transferred to fresh water and sea water (26.permill.) at 1 and 8.degree. C. Exposure to fresh water at 1.degree. C gave a moderate reduction in plasma osmolality and Na+ and Cl- concentrations. In sea water (26.permill., 8.degree. C) there was an initial rise in plasma osmolality, plasma concentrations of Na+, Cl- and Mg2+ and tissue concentrations of Na+ and Cl-. The initial rise was followed by a reduction and stabilization at levels considerably higher than in fresh water. After transfer to sea water at 1.degree. C, there was no such stabilization. The concentrations continued to increase throughout the experiment, and were accompanied by marked tissue dehydration. The fish in this group started to die after 2-3 days of exposure and no fish survived for more than 7 days. The results suggest that low temperatures affect the mechanisms of active ion transport in gills and kidneys, thus reducing the capacity for osmotic regulation.

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