Abstract
1. 1. Changes m hypoosmoregulatory ability in smolting sea trout, Satmo trutta, were monitored by performing regular sea-water challenge tests from February to July. 2. 2. Sea-water tolerance was fully developed in April and was then maintained during spring and summer. 3. 3. A high capacity to regulate magnesium ions correlated well with the smoltification and culminated in May. 4. 4. High and stable plasma electrolyte levels were reached after 24 hr in sea-water. In order to discriminate between parr and smolt, this should be the most effective exposure time in sea-water. 5. 5. Stress of shorter duration had no influence on the outcome of the sea-water challenge test, whereas prolonged stress affected the hypoosmoregulatory capability.
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