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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 8.7.degree. 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 8.7.degree. C and 6.0.degree. 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 6-7.degree. C.

US$19.90

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


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