Effects of hypoxia on growth and metabolism of juvenile turbot

Type Article
Date 2000-08
Language English
Author(s) Pichavant Karine, Person Jeannine
Affiliation(s) IFREMER, Ctr Brest, Physiol Poissons Lab, F-29280 Plouzane, France.
Univ Bretagne Occidentale, Lab Physiol Syst Integres, F-29285 Brest, France.
Source Aquaculture (0044-8486) (Elsevier), 2000-08 , Vol. 188 , N. 1-2 , P. 103-114
DOI 10.1016/S0044-8486(00)00316-1
WOS© Times Cited 108
Keyword(s) Acid base status, Ion regulation, Nitrogen excretion, Oxygen consumption, Feed utilization, Growth, Hypoxia, Turbot
Abstract The effects of hypoxia on growth, feed efficiency, nitrogen excretion, oxygen consumption and metabolism of juvenile turbot (120 g) were studied in a 45-day experiment carried out in sea water at 17.0 +/- 0.5 degrees C and 34.5 ppt salinity. Fish were fed to satiation at O-2-concentrations of 3.5 +/- 0.3, 5.0 +/- 0.3 mg l(-1) (hypoxia) and 7.2 +/- 0.3 mg l(-1) (normoxia). Both feed intake (FI) and growth were significantly lower under hypoxia than under normoxia, with no significant differences being observed between 3.5 and 5.0 mg O-2 l(-1). During the first 2 weeks of the experiment, FI was halved under hypoxic conditions, and there were large differences among treatments in feed conversion ratio (FCR), i.e., it was 3.2, 1.5, and 0.9 in turbot exposed to 3.5, 5.0, and 7.2 mg O-2 l(-1), respectively. Thereafter, FCR was not significantly affected by O-2-concentration. Nitrogen excretion and oxygen consumption of feeding fish were significantly higher under normoxia than under hypoxia, but following 7 days of feed deprivation oxygen consumption was similar under normoxia and hypoxia. Plasma osmolarity, ionic balance, and acid-base status were not affected by the two hypoxic conditions tested. Overall, our results indicate that turbot have some capacity to adapt to relatively low ambient O-2-concentrations.
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