Abstract
Blood parameters in postsmolt Atlantic salmon were studied during artificial introduction of abrupt salinity changes between 34% and 10 and 5‰. Mortality in the test groups did not increase compared to the control group. Plasma levels of Na + and Cl − were significantly decreased in the low-salinity periods. Plasma levels of Mg 2+ and haematocrit were significantly increased during low salinity, and plasma levels of K + were not significantly affected by the changes in salinity. This experiment indicates that salinity changes alone will not cause heavy mortality in fjord-based salmon farms, but salinity changes in combination with other environmental factors may represent a stress situation for postsmolt Atlantic salmon.
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