Distribution of chambered oyster in oyster culture areas in Japan

Abstract

Distribution of chambered oyster Crassostrea gigas in some oyster culture areas in Japanwas examined. In some areas (Yamada, Ozuchi, Ofunato, Takenoura, Mangoku-Ura), a lot of chambers were observed in almost all stocks, when shells were sectioned.In other areas (Nagazura-Ura, Matsushima, Jigozen, Ten-no, Ondo), however, few chambers were observed. The chambers were generally sealed with jelly-like material, mud, mud tube of polychaete, polychaete Terebella ethrenbergi, or foul-smelling water.