Aquatic Information Center



Columnaries Disease

Ruth Francis-Floyd

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Columnaris is a bacterial disease of freshwater fish which frequently causes problems during warm weather. The disease is caused by a gram negative rod, Flexibacter columnaris. Prior to 1974, the organism was known as Condrococcus columnaris. Common names for this disease include "fin rot", "cotton wool disease", "cotton mouth disease" or "saddleback disease." 

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