Bacterial Injury in Pearl Oysters after Nucleus-Insertion, with Special Reference to Infection Tests and Characteristics of Isolated Bacteria

摘要

This investigation was undertaken in an attempt to clarify bacterial influence in producing cultured pearls. Judging from the infection tests of bacteria which were isolated from diseased mother shells with or without nuclei, it seems that bacteria play some role in the mortality of mother shells, the formation of waste, baroque or muddy pearls, and the falling out of the inserted nuclei. Presumably, these facts are considered as a sort of putrefactive phenomenon on caused by bacteria in abiotic environment, where bacteria are apt to develop around the nucleus inserted by operation. It is reasonably certain that the physical condition of mother shells is an important factor in connection with the bacterial injury in cultivating the mother shells of pearls. The description was made on the general characteristics of three types of bacteria, which seem responsible for the phenomena mentioned above, and also on the results of their inhibitory tests with antibiotics.