Evolution de la mortalité des huîtres portugaises C. angulata dans le bassin de Marennes

A year after the end of the Gill disease which heavily struck the Portuguese oysters Cassostrea angulata Lmk. (Marteil, 1968), a new disease whose causes are still unexplained caused a massive mortality in the same species in the summer of 1970 (Comps, 1972). It can be considered, in 1973, that the successive losses lead to the quasi-extinction of the species C. angulata in the farms of the Marennes basin, since, contrary to what has been done in the case of the Malpèque disease in Canada, the indigenous specious was replaced by another species, the Pacific oyster Crassostrea gigas Thunberg.