Effect of zinc sacrificial anode degradation on the defence system of the Pacific oyster, Crassostrea gigas: Chronic and acute exposures |
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| Authors: | Elmina Mottin Christelle Caplat Thomas Latire Antoine Mottier Marie-Laure Mahaut Katherine Costil Daniel Barillier Jean-Marc Lebel Antoine Serpentini |
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| Institution: | UMR 100 IFREMER "Physiologie et Ecophysiologie des Mollusques Marins", IFR 146 ICORE - IBFA, Université de Caen Basse-Normandie, Campus 1, Bat M, Esplanade de la Paix, 14032 Caen Cedex, France; FRE 3484 BioMEA, CNRS INEE, Université de Caen Basse-Normandie, Campus 1, Bat M, Esplanade de la Paix, 14032 Caen Cedex, France; Equipe de Recherche en Physico-Chimie et Biotechnologie, EA 3914, Université de Caen Basse-Normandie, Hall Technologique, 145 Chemin de la Crespinière BP 48, 50130 Cherbourg-Octeville, France; CNAM-Intechmer, Digue de Collignon, BP 324, 50103 Tourlaville, France. |
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| Abstract: | Two types of exposures were performed to assess the effects of zinc released from sacrificial anode degradation: a chronic exposure, in which oysters were exposed to 0.53±0.04mgZnL(-1) for 10weeks, and an acute exposure, where oysters were exposed to 10.2±1.2mgZnL(-1) for 1week. At the end of the acute exposure experiment, 81.8% mortality was recorded. In contrast, no mortality was detected after 10weeks exposure. Moreover, all of the immune system biomarkers studied, except the number of circulating haemocytes, were stimulated by a moderate level of zinc and inhibited by a high level. Our exposure conditions did not induce SOD or MXR mRNA expression in gills and digestive gland. However, an increase of MT mRNA is observed in these tissues. The results indicate that oysters are sensitive to acute zinc toxicity but are only moderately affected by a mild zinc concentration. |
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