vibrio ordalii vibrio ordalii vibrio ordalii is a gram-negative, rod-shaped bacterium. it causes vibriosis in fish. its type strain is atcc 33509 (=df3k =dom f3 kid). vibrio ordalii scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: vibrionales family: vibrionaceae genus: vibrio species: v. ordalii binomial name vibrio ordaliischiewe et al. 1982