Acclimatation du clam (Venus mercenaria L.) en Bretagne

Large quantities of clams (Venus mercenaria L.) from the U.S.A. have been introduced in Brittany since 1930. Stopped in 1940, their importation started again in 1954. These shellfishes, designed to be immediately sold for eating, only stayed for a short period of time in the ponds and farms of the Belon, Pénerf and Etel rivers, or in the Gulf of Morbihan, where they were stocked. However, some individuals managed to escape the fisheries and stayed buried for years where they had been sown. Lambert (1949) reported how some twenty year-old clams were found on a farm on the Etel River. In some ponds of the Gulf of Morbihan and the Pénerf river, one can still find clams which have been stocked there before 1940: their size is huge and reaches 10 to 14 cm, and they weight from 350 to 500 g. [...]