Fin Rot


Fish may have deteriorating fins, often with red or white edges. Secondary Fungal infections often occur.

Bacterial infection caused by Aeromonas and/or Pseudomonas bacteria often precipitated by poor water quality, low water temperatures, or a combination of both.


You will first want to determine the specific cause of the illness, so check your water’s quality Ammonia, Nitrite, pH, and Nitrate levels as well as the temperature. Be sure to provide optimal water conditions and the correct water temperature for the species of fish you are keeping. Treat with Kanacyn, Tetracycline, Furacyn, Nitrofura-G or Penicillin. Basically, you want an antibiotic specific for Aeromonas and Pseudomonas bacteria. The use of a medicated food is also wise. Treat the fish in isolation (i.e., quarantine tank) if only one fish is sick. If not, the whole tank should be treated. In either case, water conditions must be improved and proper temperature maintained for all fish. Adding salt to the water may be helpful.

The success rate for treating Fin Rot is good providing the illness is caught early and water conditions are kept optimal. Left untreated this infection can be deadly. Early treatment is essential! Once treated, fin tissue lost to this illness will grow back providing the fin rays and/or fin bases have not been damaged.

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