Nutrition and reproduction are key parameters in the interaction process leading to Crassostrea gigas oyster summer mortality in France

Type Slideshow
Date 2006-11-06
Language English
Author(s) Samain Jean-Francois, Degremont LionelORCID, Soletchnik Patrick, Ropert MichelORCID, Bedier Edouard, Mazurie Joseph, Mazurie Joseph, Martin Jean-Louis, Moal Jeanne, Mathieu Michel, Pouvreau StephaneORCID, Lambert Christophe, Escoubas Jean-Michel, Nicolas Jean-Louis, Le Roux Frédérique, Renault Tristan, Burgeot Thierry, Bacher CedricORCID, Boudry PierreORCID
Meeting International Woorkshop on Reproduction and Nutrition of Mollusks held
Keyword(s) Genetic, Pathologie, Mortality, Crassostrea gigas, Pacific oyster, Reproduction, Nutrition, Physilogy
Abstract Complex interactions between oyster, environment and pathogens were observed during the MOREST (2001-2005) project on summer mortality events of Crassostrea gigas oysters in France. The talk will show how nutrition level increasing reproductive intensity generates a risk for pathogen infection under synergistic effect of temperature and stress. Moreover, a genetic component is associated to specific reproductive performances and spawning behaviour. To better understand origin of such resistance or susceptibility to summer mortality, other characteristics as stress susceptibility, energy management and hemocyte activities of oysters from the two phenotypes were compared. This first comparison suggests interactions between stress, reproduction and defence mechanisms. Molecular tools are now necessary to better identify the concerned genes.However, none of the different factors involved in the environment/host/pathogen interaction process, can separately account for summer mortality, and all of these conditions seem necessary to reproduce the event. In the present case study of C. gigas oyster summer mortality, these necessary interactions provide different possibilities to prevent or reduce the problem by breaking one of them. Short term and long term options of reducing risk will be presented and discussed. Short term options include culture practices (temperature, trophic conditions, sediment distance, density, rearing steps, reduction of reproduction and stress). Options can depend also on biological material, with possibility of using triploids. Long term options by genetic selection of resistant oysters or by management of nutrients and organic matter from river watersheds are also possibilities. A risk analysis is necessary for each growing area to adapt the best strategy to the local environmental and culture conditions. The assessment of the economical aspects will be necessary before validation of these choices. This case study presents synergistic activities of scientists and resource managers in enhancing or restoring oyster populations in France.
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Samain Jean-Francois, Degremont Lionel, Soletchnik Patrick, Ropert Michel, Bedier Edouard, Mazurie Joseph, Mazurie Joseph, Martin Jean-Louis, Moal Jeanne, Mathieu Michel, Pouvreau Stephane, Lambert Christophe, Escoubas Jean-Michel, Nicolas Jean-Louis, Le Roux Frédérique, Renault Tristan, Burgeot Thierry, Bacher Cedric, Boudry Pierre (2006). Nutrition and reproduction are key parameters in the interaction process leading to Crassostrea gigas oyster summer mortality in France. International Woorkshop on Reproduction and Nutrition of Mollusks held. https://archimer.ifremer.fr/doc/00000/3467/