Abstract
1. 1. One-year-old Baltic salmon were reared in fresh water (FW) and brackish water (BW, salinity 6 ppt) for their second year of life. 2. 2. After 2.5 months of adaptation, the plasma ionic and osmotic concentrations of FW and BW fish responded similarly to 48 hr exposure to deionized water (DW), FW, BW and artificial sea-water (SW, salinity 17 ppt), but there were some differences in the intracellular ion and erythrocytic haemoglobin and ATP concentrations. 3. 3. After 10 months of adaptation, the ionic and osmotic balance of SW-exposed fish was similar in FW and BW fish, but the BW fish lost more ions in DW exposure than the FW ones. 4. 4. The results indicate that the overall capacity of young salmon to regulate hyper and hypoosmotically is only slightly affected by adaptation to BW. The differences in intracellular ion and ATP concentrations may partly be related to differences in the respiratory metabolism.
Published Version
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