Flavobacteria and Cytophagas

An increasing number of Gram-negative chromogens have become associated with fish diseases particularly involving the gills and external surfaces [fin/tail rot]. New additions to the list of pathogens include Chryseobacterium piscicola, Flavobacterium oncorhynchi, Tenacibaculum dicentrarchi, T. discolor, T. gallaicum and T. soleae with research interest focusing on molecular diagnoses and disease control by vaccination, probiotics, immunostimulants and bacteriophages.