The class Flavobacteria is composed of a single order of environmental bacteria.


Flavobacteria are a group of commensal bacteria and opportunistic pathogens. Flavobacterium psychrophilum causes the septicemic diseases rainbow trout fry syndrome and bacterial cold water disease. According to Bernardet et all Flavobacteria are gram-negative aerobic rods, 2-5 mm long, 0.3-0.5 mm wide, with rounded or tapered ends that are motile by gliding, yellow (cream to orange) colonies on agar, decompose several polysaccharides but not cellulose, G+C contents of 32 - 37 %, and are widely distributed in soil and freshwater habitats. The type species is F. aquatile.

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