ichthyenterobacterium ichthyenterobacterium ichthyenterobacterium is a gram-negative, aerobic and pleomorphic genus of bacteria from the family of flavobacteriaceae with one known species (ichthyenterobacterium magnum). ichthyenterobacterium magnum has been isolated from the intestine of the fish paralichthys olivaceus. ichthyenterobacterium scientific classification domain: bacteria phylum: bacteroidota class: flavobacteria order: flavobacteriales family: flavobacteriaceae genus: ichthyenterobacteriumshakeela et al. 2015 type species ichthyenterobacterium magnum species i. magnum