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. Bœuf-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 Biologie et Physiologie Cellulaires, UFR Sciences et Techniques,
Université de Bretagne occidentale, 6 avenue Le Gorgeu, BP 809 29285 Brest
Cédex, France. Tel.: +33 02 98
01 72 60; fax: 33 02 98 01 63 11; email:Karine.Pichavant@univ-brest.fr)