Exposure to chronic moderate hypoxia impacts physiological and developmental traits of European sea bass (Dicentrarchus labrax) larvae

Type Article
Date 2015-02
Language English
Author(s) Vanderplancke Gwenaelle1, Claireaux Guy1, 2, Quazuguel PatrickORCID1, Huelvan Christine1, Corporeau Charlotte1, Mazurais DavidORCID1, Zambonino-Infante Jose-LuisORCID1
Affiliation(s) 1 : Ifremer, LEMAR UMR 6539 CNRS-UBO-IRD-Ifremer, ZI de la Pointe du Diable, CS 10070, 29280, Plouzané, France
2 : Université de Bretagne Occidentale, LEMAR UMR 6539 CNRS-UBO-IRD-Ifremer, ZI de la Pointe du Diable, CS 10070, 29280, Plouzané, France
Source Fish Physiology and Biochemistry (0920-1742) (Springer), 2015-02 , Vol. 41 , N. 1 , P. 233-242
DOI 10.1007/s10695-014-0019-4
WOS© Times Cited 9
Keyword(s) Hypoxia, Fish larvae, Energy metabolism, Maturation
Abstract Since European sea bass (Dicentrarchus labrax) larvae occurred in coastal and estuarine waters at early life stages, they are likely to be exposed to reduced dissolved oxygen waters at a sensitive developmental stage. However, the effects of hypoxia at larval stage, which depend in part on fish species, remain very poorly documented in European sea bass. In the present study, the impacts of an experimental exposure to a chronic moderate hypoxia (40 % air saturation) between 30 and 38 days post-hatching on the physiological and developmental traits of European sea bass larvae were assessed. This study was based on the investigation of survival and growth rates, parameters related to energy metabolism [Citrate Synthase (CS) and Cytochrome-c Oxidase (COX) activities], and biological indicators of the maturation of digestive function [pancreatic (trypsin, amylase) and intestinal (Alkaline Phosphatase "AP" and Aminopeptidase-N "N-LAP") enzymes activities]. While condition of hypoxia exposure did not induce any significant mortality event, lower growth rate as well as CS/COX activity ratio was observed in the Hypoxia Treatment group. In parallel, intestinal enzyme activities were also lower under hypoxia. Altogether, the present data suggest that sea bass larvae cope with moderate hypoxia by (1) reducing processes that are costly in energy and (2) regulating mitochondria functions in order to respond to energy-demand conditions. Both these effects are associated with a delay in the maturation of the digestive function.
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Vanderplancke Gwenaelle, Claireaux Guy, Quazuguel Patrick, Huelvan Christine, Corporeau Charlotte, Mazurais David, Zambonino-Infante Jose-Luis (2015). Exposure to chronic moderate hypoxia impacts physiological and developmental traits of European sea bass (Dicentrarchus labrax) larvae. Fish Physiology and Biochemistry, 41(1), 233-242. Publisher's official version : https://doi.org/10.1007/s10695-014-0019-4 , Open Access version : https://archimer.ifremer.fr/doc/00253/36433/