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A novel Gram-stain-negative, obligately aerobic, non-motile and coccus-shaped bacterium, designated strain CN1T, was isolated from the intestine of a Korean rockfish, Sebastes schlegelii. The optimum growth condition for strain CN1T was 25 °C, pH 7 and 0–1 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain CN1T was in the genus Comamonas and that the nearest type strain was Comamonas koreensis YH12T with 98.65 % 16S rRNA gene sequence similarity. The primary cellular fatty acids of strain CN1T were summed feature 3 (comprised of C16 : 1ω7c and/or C16 : 1ω6c), C16 : 0 and summed feature 8 (comprised of C18 : 1ω6c and/or C18 : 1ω7c). The predominant isoprenoid quinone was ubiquinone Q-8. The polar lipids were phosphatidylglycerol, phosphatidylethanolamine, an unidentified lipid, an unidentified phospholipid and two aminophospholipids. The DNA G+C content was 65.5 mol%. The phenotypic, phylogenetic and genotypic analyses indicated that strain CN1T represents a novel species of the genus Comamonas, for which the name Comamonas piscis sp. nov. is proposed. The type strain is CN1T ( = KACC 18403T = JCM 30718T).
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