A facultatively anaerobic, gram-negative, gliding bacterium was isolated from the gills of freshwater fish. Its deoxyribonucleic acid base composition (33.7 mol% guanine plus cytosine), lack of microcysts or fruiting bodies, cell size (0.5 by 8.0 μm), and hydrolysis of carboxymethylcellulose and chitin place it in the genus . This aquatic cytophaga is differentiated from other cytophagas by its fermentation of carbohydrates, proteolytic capabilities, and a number of additional physiological and biochemical tests. The organism was compared to other similar isolates reported from fish, and it appears to belong to a new species, for which the name is proposed. The type strain of , N, has been deposited with the American Type Culture Collection under the accession number 29551.


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