Aeromonas
A genus of facultatively anaerobic, gram-negative rod-shaped bacteria in the family Pseudomonadaceae, usually resident in richly organic water and soil, and on fish species.
- atypical A. salmonicida — miscellaneous infections of fish, not the identified A. salmonicida salmonicida, the cause of goldfish furunculosis, but may cause goldfish ulcer disease.
- A. hydrophilia — causes ulcerative stomatitis (mouthrot, canker) of captive reptiles. Ulcerative lesions in the mouth may extend to cause osteomyelitis of the jaw bone, inflammation of the harderian gland and invasion of the corneospectacular area causing severe swelling. This bacterium may also cause septicemia, especially in aquatic snakes with access to infected water; causes fin, tail and snout erosions (red sore disease) in captive fish. May also cause diarrhea in foals.
- A. liquefaciens — a group of closely related, motile aeromonads which cause hemorrhagic septicemia in many cultured pond-fish, aquarium fish and salmonids.
- A. salmonicida salmonicida — causes goldfish ulcer disease, furunculosis in salmonids and erythrodermatitis in carp.






