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.
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