Comparative effects of long-term hypoxia on growth, feeding and
oxygen consumption in juvenile turbot and European sea bass
K. Pichavant, J. Person-Le-Ruyet,
N. Le Bayon, A. Severe, A. Le Roux,
G. Boeuf-2001
Journal of
Fish Biology, 59(4):
875-883
Abstract:
When juvenile turbot Scophthalmus
maximus and sea bass Dicentrarchus labrax were fed to
satiation, growth and food intake were depressed under
hypoxia (3·2±0·3 and 4·5±0·2mg O2l-1).
However, no significant difference in growth was
observed between fishes maintained in hypoxia and fed
to satiation and fishes reared in normoxia (7·4±0·3mg O2l-1)
and fed restricted rations (same food intake of fishes
at 3·2mg O2l-1). Routine oxygen consumption of fishes
fed to satiation was higher in normoxia than in
hypoxia due to the decrease in food intake in the
latter. Of the physiological parameters measured, no
significant changes were observed in the two species
maintained in hypoxia. This study confirms the significant
interaction between environmental oxygen concentrations,
feeding and growth in fishes. Decrease in food intake could
be an indirect mechanism by which prolonged hypoxia
reduces growth in turbot and sea bass, and may be a way
to reduce energy and thus oxygen demand.
(Laboratoire
de Physiologie des Poissons, IFREMER, Centre de Brest Station Ressources
Vivantes, BP 70, 29280, Plouzané, France, Tel.: +33 02 98 01 72 60; fax: 33
02 98 01 63 11; email:Karine.Pichavant@univ-brest.fr)