Fin rot of fish is caused by
Aeromonas
Pseudomonas
Branchiomyces
Xenopsylla
B.
Pseudomonas
Fin rot disease of fish is caused by a bacterial infection (e.g., Aeromonas or Psudomonas infection). It is a common symptom of a bacterial disease that affects variety of fishes. Sometimes fin rot begins after an injury to the fish's fins or tail.