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The effects of dietary NaCl supplement on hypo‐osmoregulatory ability and sea water performance of Arctic charr ( Salvelinus alpinus L.) smolts
Author(s) -
Staurnes Magne,
Finstad Bengt
Publication year - 2000
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1046/j.1365-2109.2000.00495.x
Subject(s) - salvelinus , biology , zoology , arctic , osmoregulation , photoperiodism , smoltification , fish <actinopterygii> , fishery , salmonidae , ecology , trout , salinity , botany , salmo
Groups of one‐year‐old smolts of Arctic charr ( Salvelinus alpinus L.) reared under a simulated natural photoperiod were fed pelleted feed with a NaCl content of either 1.5% or 9.5% for 6 weeks before release in a river in northern Norway. There were no differences in growth before release between fish fed the two diets. Smolts fed the 9.5% NaCl diet had better hypo‐osmoregulatory ability than those fed the 1.5% diet, and a level of gill Na + ‐K + ‐ATPase activity that was several times higher. One of the two groups that had been fed the 9.5% NaCl diet had both a significantly higher recapture rate and growth in sea than the two groups fed the 1.5% NaCl diet, whereas this was not true for the other 9.5% NaCl diet group. The results indicate that a NaCl‐enriched diet could be used to ensure sufficient hypo‐osmoregulatory ability of charr smolts that would otherwise have insufficient regulatory ability.