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Koi Fin & Tail Rot

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Fin & Tail Rot are a bacterial infection caused by predator type, life threatening bacteria such as
Aeromonas, Pseudomonas or Flexibacter that are present in great numbers in every pond fish and koi pond.

These bacteria take advantage of stressed koi and pond fish. It is not uncommon for secondary infections to accrue such as fungal infections “white cotton wool-like tufts”.


Most of the time fin & tail rot are caused by stress, caused by, rough handling, poor koi pond water conditions or even fear.

When you see the beginning of fin & tail rot start looking for other koi fish health problems that might exist. Fin & Tail rot are the”Red Flag” for other koi pond or health problems.

Fin & tail rot can also be caused by a weakened immune system which could be brought on by stressful conditions or sickness.

One of the best treatments for koi fin and tail rot is medicated koi food.