Symptoms

The first symptoms of fin & tail rot are milky white areas appearing on the koi fish’s fins or tail around the edges. As the disease progresses the bacteria eats all the clear fin membrane away, leaving just the fin and tail rays. If the fin & tail rot are left untreated they can slowly eat away the entire fin and tail along with the fin rays and start to invade the fish’s body. Some koi fish with frayed fins and tails are misdiagnose with fin and tail rot but are caused by fin-nipping or damaged by something in your fish pond.

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