Abstract
Isolation of halophilic bacteria was conducted on 85 samples of marine products. As a result, 43 strains of Gram-negative bacilli were isolated on mannite-salt agar (salt concentration: 7.5 per cent). Of these strains, 42 grew on ordinary agar media, but one (No.33) did not; 31 strains fermented mannitol.
Strain No.33 was of Gram-negative bacilli, which grew on mannite-salt agar but not on ordinary agar media. This strain was examined for biological characters. The results indicated that the organism of this strain was a motile, pleomorphic rod producing aerobic growth on ordinary agar media. It was hemolytic, produced no pigments soluble in culture media and no indole, and caused no coagulation of milk media and no reduction of potassium nitrate. It grew well in peptone water containing 7.5 per cent salt and decomposed glucose.
Judging from the biological characters mentioned above, the isolated strain No.33 is considered to belong to the pseudomonas group. It is also similar the Takikawa strain which was described by Takikawa as a causative agent of food poisoning.
In short, only one strain of halophilic: bacteria was isolated from the 85 samples of marine products investigated.
