Osmoregulation in immature atlantic salmon (Salmo salar L.) following transfer from sea-water to fresh water |
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| Affiliation: | 1. Department of Gametes and Embryo Biology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland;2. Laboratory for Functional Genome Analysis (LAFUGA), Gene Center, Ludwig Maximilian University of Munich, 81377 Munich, Germany;3. Fish Physiology and Genomics, UR1037 (LPGP), INRAE, Rennes, France |
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| 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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