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Effect of low temperature on seawater tolerance in atlantic salmon salmo salar smolts

, : Effect of low temperature on seawater tolerance in atlantic salmon salmo salar smolts. Aquaculture 84(2): 167-172

Mortality and capacity for hyposmotic regulation in seawater were monitored at different temperatures in 1-year-old Atlantic salmon (Salmo salar) in March and May. A static seawater (33.permill.)challenge test was performed at temperatures of 2.0, 4.1, 6.0 (May only) and C. Mortality, plasma Na+ and Cl- concentrations and muscle water content were monitored from 12 to 96 h. In March, with pre-smolts, survival increased with increasing temperature and the fish were unable to regulate plasma Na+ and Cl- concentrations or muscle water content at any temperature. At the end of May when the fish had smoltified, only smolts at C and C were able to regulate plasma Na+ below 170 mmol l-1 and these fish also showed better regulation of muscle water. These results indicate the existence of a lower temperature limit for transfer of Atlantic salmon smolts to seawater, and support earlier suggestions that Atlantic salmon smolts should not be transferred to seawater at temperatures lower than C.


DOI: 10.1016/0044-8486(90)90346-o

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