Déterminisme des mortalités estivales d'huîtres creuses Crassostrea gigas dans le bassin de Marennes-Oléron : choix d'un site atelier pilote, prééchantillonnage et perspectives

Since 1988, seasonal, chronic mortality (up to 30-40 %) has been occurring at oyster farms in the Marennes-Oléron Bay, namely at the Ronce and Perquis sand flats. The particular geographic position on the southern part of the bay, between the Seudre River and the Maumusson Strait, confers a relative specificity to these oyster farming areas. Production in this area is on the order of 8,000 to 10,000 t of the 30,000 t of oysters produced annually in the Bay. Although limited in surface area (180 ha out of a total of 4,500 ha), this high proportion of production can be attributed to the fact that this zone is mostly dedicated to the finishing process before commercialisation. Due to its economic importance, oyster farming is vital for local businesses.