Abstract
Viable counts were determined on the intestinal contents of 4 species of salmon (33 specimens), 6 other species of fish living in the Bering Sea (14 specimens) and 7 species of fish living off the south coast of Hokkaido (12 specimens). At the same time, their ambient sea waters and several species of zoo-plankton were examined. A total of 1100 strains were isolated from the above samples. The composition of the microflora was determined according to the scheme of SHEWAN et al. (1960).
The results are summarized as follows:
1) The viable microorganisms in the intestinal contents of both the salmon and the other species of fish numbered 102 to 107 per gram.
2) Vibrio was generally predominant in the intestinal microflora of both the salmon and the other species of fish.
3) The intestinal microflora of the fish living in the Bering Sea differed from the microflora of their ambient sea water and the zoo-plankton.
