Abstract
In order to further our understanding of the ecology and distribution of Vibrio anguillarum and its related organisms, we carried on a bacterial investigation in Otsuchi Bay from 1979 to 1981 where coho salmon (Oncorhynchus kisutch) were cultured. Fifty-eight strains out of 5337 isolates were identified as V. anguillarum. Thirty-six strains of the 58 strains were assumed to be originated from pen-cultured fish and were classified as serotype J-O-3. One strain, classified as J-O-1, was isolated from sea water far away from the rearing pen in Otsuchi Bay. The other twenty-one strains classified as J-O-8 were isolated from marine environments e.g. sea water, mud, plankton etc., all over the Otsuchi Bay.
