Flavobacterium columnare
Template:Short description Template:Speciesbox
Flavobacterium columnare is a thin Gram-negative rod bacterium of the genus Flavobacterium. The name derives from the way in which the organism grows in rhizoid columnar formations.[1]
The species was first described by Davis (1922), and the name was validated by Bernardet and Grimont (1989).[2]
Flavobacterium columnare can be identified in the laboratory by a five-step method that demonstrates:
- the ability to grow on a medium containing neomycin and polymyxin B
- production of yellow pigmented rhizoid (root-like in appearance) colonies
- production of a gelatin-degrading enzyme
- binding of Congo red dye to the colony
- production of a chondroitin sulfate-degrading enzyme[3]
The species has been known previously as Flexibacter columnaris, Bacillus columnaris, and Cytophaga columnaris.
Flavobacterium columnare is one of the oldest known diseases among warm-water fish, and manifests itself as an infection commonly known as columnaris. Infections are the second leading cause of mortality in pond raised catfish in the southeastern United States.[3] Early treatment with potassium permanganate has been shown to increase survival rate, although the difference was not statistically significant.[4]
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