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Effects of salinity on the ionic balance and growth of juvenile turbot
Gaumet, F.; Boeuf, G.; Sévère, A.; Le Roux, A.; Mayer-gostan, N. (1995). Effects of salinity on the ionic balance and growth of juvenile turbot. J. Fish Biol. 47(5): 865-876
In: Journal of Fish Biology. Fisheries Society of the British Isles: London,New York,. ISSN 0022-1112; e-ISSN 1095-8649, more
Peer reviewed article  
Available in  Authors 
Keywords
    Aquatic organisms > Marine organisms > Fish > Marine fish
    Biology > Physiology > Animal physiology > Fish physiology
    Environmental effects > Salinity effects
    Osmoregulation
    Oxygen consumption
    Population functions > Growth
    Properties > Biological properties > Euryhalinity
    Scophthalmus maximus (Linnaeus, 1758) [WoRMS]
    Marine/Coastal
Authors  Top 
  • Gaumet, F.
  • Boeuf, G., more
  • Sévère, A.
  • Le Roux, A.
  • Mayer-gostan, N.
Abstract
    The effects of salinity changes (27, 19 and 10‰) on seawater-adapted juvenile turbot were studied on their plasma osmolarity and ion concentrations, on oxygen consumption, on gill Na+,K+-ATPase activity after 3 months and on growth parameters. All plasma concentrations (except chloride) were unchanged, suggesting that fish were well adapted to their environment. Oxygen consumption was significantly decreased in the 19 and 10‰ groups, where fish weighed significantly more 105 days after transfer than fish maintained in sea water. These results, and the fact that apparent food conversion rates were lower in a diluted environment, suggest that on a long term schedule growth conditions could be improved by adaptation to brackish waters (salinities between 10 and 19‰). The effects of transfer from sea water to 27, 19, 10 and 5‰ were also followed during the first 3 weeks. With salinity 10‰ a steady state was reached on day 21 with all plasma values within the same range. The significant differences observed in osmolarity, plasma ion concentrations and Na+,K+-ATPase activity 3 weeks after transfer of juveniles to 5‰ salinity, compared with transfers in higher salinities, suggest that there is a threshold of acclimation of turbot to a hypotonic environment.
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