Effect of zinc sacrificial anode degradation on the defence system of the Pacific oyster, Crassostrea gigas : Chronic and acute exposures

• Published in: Marine Pollution Bulletin
• Main Authors: Mottin, Elmina, Caplat, Christelle, Latire, Thomas, Mottier, Antoine, Mahaut, Marie-Laure, Costil, Katherine, Barillier, Daniel, Lebel, Jean-Marc, Serpentini, Antoine
• Other Authors: Interactions Cellules Organismes Environnement (ICORE), CHU Caen, Normandie Université (NU)-Tumorothèque de Caen Basse-Normandie (TCBN)-Normandie Université (NU)-Tumorothèque de Caen Basse-Normandie (TCBN)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Institut de Biologie Fondamentale et Appliquée Caen (IBFA), Biologie des mollusques marins et des écosystèmes associés (BioMEA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie Biologique (LCB), Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine, Institut national des sciences et techniques de la mer (INTECHMER), Conservatoire National des Arts et Métiers CNAM (CNAM)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2012
• Subjects: Zinc; Sacrificial anode; Crassostrea gigas; Laboratory exposures; Immune parameters; mRNA expression; [SDE]Environmental Sciences; Pacific; Pacific oyster
• Online Access: https://hal-normandie-univ.archives-ouvertes.fr/hal-02314104; https://doi.org/10.1016/j.marpolbul.2012.06.017

International audience 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 ± 0.04 mg Zn L−1 for 10 weeks, and an acute exposure, where oysters were exposed to 10.2 ± 1.2 mg Zn L−1 for 1 week. At the end of the acute exposure experiment, 81.8% mortality was recorded. In contrast, no mortality was detected after 10 weeks 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.