aeromonadaceae aeromonadaceae the aeromonadaceae are gram-negative bacteria. the species are facultative anaerobic organisms. the cells are rod-shaped. they are mostly found in estuarine waters and fresh water, also in soil and sewage. some are pathogenic for humans and other animals such as fishes and frogs. aeromonadaceae aeromonas hydrophila scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: aeromonadales family: aeromonadaceae genera aeromonas oceanimonas oceanisphaera pseudaeromonas tolumonas zobellella