Abstract
1. 1. Immature Atlantic salmon post-smolts weighting approximately 150 g were transferred abruptly to fresh water (FW) after 5 months in sea water (SW). 2. 2. Losses of ions and gain of body water are reversed after 3 days with about 10–12 days taken for complete FW adaptation. 3. 3. Immediately on transfer from SW to FW, immature salmon take up sodium at 45 μmol/kg/hr, about one-third the rate observed in maturing salmon on their spawning migration. 4. 4. The sodium uptake rate increases to that of maturing salmon after 2 days in freshwater. Differences in the osmoregulatory ability of immature and maturing salmon are discussed.
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