Fin and tail rot
Fin rot is a common bacterial infection of the fins and tail, usually caused by opportunistic Gram-negative bacteria such as Aeromonas, Pseudomonas and Flavobacterium acting on tissue already weakened by poor water quality or injury. The fin margins fray, erode and may develop red inflamed edges. Untreated, the erosion progresses to the body and can become systemic.
Quick facts
- Type:
- Infectious
- Typical onset:
- Subacute
- Body systems:
- Integumentary
- Affected species:
- BETTA, GOLDFISH, KOI
Sources & references
- Merck Veterinary Manual — Discusses opportunistic bacterial fin and skin infections in aquarium fish and the role of water quality.
- PetMD — Owner-oriented overview of fin rot causes, signs and treatment in pet fish.
This content is for educational purposes and is not a substitute for professional veterinary advice. If you are worried about your pet, contact your veterinarian.