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The bacterial flora in 9 solar salt samples imported in 1972 were investigated. Bacterial counts were conducted by the smear plate method using media containing 0, 5, 5, 12, and 25% NaCl. In general, the highest bacterial counts, ranging from 103 to 105 bacteria per gram of salt, were obtained in 25% NaCl medium.It was shown that most of the bacteria present in salt samples could not grow in 5% or less NaCl. Among 63 strains isolated from 25% NaCl containing medium 49 were identified as genus Halobacterium. These organisms were obligately aerobic, catalase positive, non-motile, rod-shaped, and required at least 12%. NaCl for growth, with the optimal salt concentration being in the range of 20 to 30%. They failed to produce hydrogen sulfide and indole. Most of them produced water insoluble red pigment, and produced nitrite from nitrate. In addition to the rod-shaped bacteria described above, 2 strains of red-colored, extremely halophilic coccus, Micrococcus morrhuae, were isolated. Furthermore, a few strains of rods or cocci which were able to grow in the range of 5 to 25% NaCl were found. Among these organisms the pigmented rod forms were identified as genus Flavobacterium, and the cocci were Micrococcus.
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