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Physiological and biochemical changes associated with massive mortality events occurring in larvae of American oyster (Crassostrea virginica)

Published online by Cambridge University Press:  29 June 2011

Bertrand Genard ,
Fabrice Pernet ,
Karine Lemarchand ,
Pierre Boudry ,
Dario Moraga  and
Réjean Tremblay
Bertrand Genard
Affiliation:
Institut des sciences de la mer, Université du Québec à Rimouski, 310 allée des Ursulines, Rimouski, Québec G5L 3A1, Canada
Fabrice Pernet*
Affiliation:
Institut de recherche sur les zones côtières, 232b rue de l’Eglise, Shippagan, Nouveau-Brunswick E8S 2L7, Canada Ifremer, Laboratoire Environnement Ressources du Languedoc Roussillon, bd Jean Monnet, 34203 Sète, France
Karine Lemarchand
Affiliation:
Institut des sciences de la mer, Université du Québec à Rimouski, 310 allée des Ursulines, Rimouski, Québec G5L 3A1, Canada
Pierre Boudry
Affiliation:
Ifremer, UMR M100 Physiologie et Ecophysiologie des Mollusques marins, 29280 Plouzané, France
Dario Moraga
Affiliation:
Institut Universitaire Européen de la Mer, Laboratoire des Sciences de l’Environnement marin, Université de Bretagne occidentale, 29280 Plouzané, France
Réjean Tremblay
Affiliation:
Institut des sciences de la mer, Université du Québec à Rimouski, 310 allée des Ursulines, Rimouski, Québec G5L 3A1, Canada
*
a Corresponding auteur: fabrice.pernet@ifremer.fr
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Abstract

In this paper, biochemical and physiological analyses were used to characterize changes associated with mortality event occurred during veliger development of American oyster, Crassostrea virginica. Biochemical analyses included the evaluation of lipid classes, fatty acid composition and total protein content. Larval physiology was evaluated by studying feeding activity, enzymes related to energy metabolism, oxidative stress levels and enzymatic antioxidant defenses. These analyses were complemented by bacterial community analyses as well as by measuring larval oyster performance. We observed that mortality events coincided with (1) strong changes in the surrounding bacterial community; (2) a progressive decrease in feeding activity; (3) higher levels of some lipid classes (free fatty acids, diglycerides, and acetone mobile phospholipids); (4) lower levels of phospholipids and protein; (5) higher contents of non-methylene interrupted dienoic fatty acids (22:2 NMI); (6) a decrease in energy metabolism activity (citrate synthase and cytochrome oxidase activities); (7) a higher oxidative stress (lipid peroxidation level); and (8) an activation of antioxidant defences before mortality (glutathione peroxidase and superoxide dismutase). We hypothesized that mortality emergence was related to higher energy consumption coupled with the progressive decline in feeding activity, lowered energy reserves and a decrease in energy metabolism activity. Thus, the low energy availability limited the efficiency of antioxidant defenses, resulting in a higher oxidative stress.

Keywords

Massive mortalityLarvaeMicrobial environmentLipidFatty acidsEnergy metabolismOxidative stressAntioxidant enzymesCrassostrea virginica
Type
Research Article
Information
Aquatic Living Resources , Volume 24 , Issue 3: Physiomar10 , July 2011 , pp. 247 - 260
Copyright
© EDP Sciences, IFREMER, IRD 2011

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