Goldfish Finrot Disease (Fin Rot)

Symptoms of Finrot or Fin Rot

Frayed fins are the main symptom or in severe cases the fins and tail can be eroded away. Fins can also have an off-white discolouration around the edge, somtimes with blood visible in the fin tissues itself. The poor state of the fins can trigger nipping by other fish in the tank or pond. Blood streaks in the fins can be a sign of the early stages of finrot, especially on if seen on the tail.

Causes of Finrot

Bacterial infection by Pseudomonas Fluorescens is the usual cause of finrot (fin rot) in goldfish though it can also be caused by Aeromanas Hydrofilia or Flexibacteria. These bacteria are usually found on most fish, however fit and healthy fish have good immunity levels to bacterial diseases so finrot often only affects fish that are under stress. Finrot can therefore also be a sign of poor water quality. Damaged fins may also become prone to secondary fungal infections especially in polluted water.

Treatment of Finrot

The first action is to check and improve the water quality. Infections can be treated with a general anti bacterial water treatment such as Parinox. If this does not work then try Neomycin in the feed and Forma-Green in the water. Affected fish can be kept in an isolation tank to prevent the disease from spreading. Adding 1 to 3 g/L of aquarium salt will help to reduce salt loss in infected fish though avoid mixing treatments without checking instructions on the treatment.


Goldfish Finrot Disease (Fin Rot) Symptoms of Finrot or Fin Rot Frayed fins are the main symptom or in severe cases the fins and tail can be eroded away. Fins can also have an off-white discolouration around the edge, somtimes with blood visible in the fin tissues itself. The poor state of the fins can trigger nipping by other fish in the tank or pond. Blood streaks in the fins can be a sign of the early stages of finrot, especially on if seen on the tail. Causes of Finrot Bacterial infection by Pseudomonas Fluorescens is the usual cause of finrot (fin rot) in goldfish though it can also be caused by Aeromanas Hydrofilia or Flexibacteria. These bacteria are usually found on most fish, however fit and healthy fish have good immunity levels to bacterial diseases so finrot often only affects fish that are under stress. Finrot can therefore also be a sign of poor water quality. Damaged fins may also become prone to secondary fungal infections especially in polluted water. Treatment of Finrot The first action is to check and improve the water quality. Infections can be treated with a general anti bacterial water treatment such as Parinox. If this does not work then try Neomycin in the feed and Forma-Green in the water. Affected fish can be kept in an isolation tank to prevent the disease from spreading. Adding 1 to 3 g/L of aquarium salt will help to reduce salt loss in infected fish though avoid mixing treatments without checking instructions on the treatment.
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