Figure 1From: Columnaris disease in fish: a review with emphasis on bacterium-host interactionsF. columnare elicited gill lesions in rainbow trout ( Oncorhynchus mykiss ) fry (operculum removed). In young fish, the disease is mostly acute and the gill is the major site of damage. The lesions are exhibited by pale necrotic areas (arrow, bar = 1 cm).Back to article page