On the Inflammatorious Changes of the Ostrea gigas in Hiroshima Bay

Abstract

In Hiroshima district cultured oysters, just one year old, have suffered since 1946 from unusually high mortality. Our pathological and histological observations of dead oysters sampled in the field revealed that many small and large round cells had invaded into organs of some individuals, especially to their ovaries, diverticulae and intestines and we found destroyed ovary cells to be phagocytosis and tissues between lobes of diverticula aimort in state of necrosis with many round cells invading around there, which is diagunosed to be possibly an acute necrotic inflammetion to which paronchymatous organs are more susceptible.