After finding that the tail of koi fish is rotten, it must be isolated, because the rotten tail is most easily attacked by other fish, which will not only get better, but also worsen. Moreover, unfinished tail is generally caused by fungi, which is separated from the original water environment and contributes to its recovery.

If the tail of koi carp is rotten, the initial treatment is the old three samples. Give it a change of water first, improve some water quality, and also discharge some mold in the water. Secondly, it is necessary to raise the temperature properly, which is very helpful for the recovery of fish. After heating up, salt is needed, and the general concentration is 3/1000 or 5/1000, which can have a therapeutic effect.

If the old three kinds can't be cured well, it means that the condition of unfinished tail is serious. At this time, some sterilization drugs should be given. The most common drug is yellow powder, that is, furacilin. Put 0.2 g into 100 kg of water, and then soak the fish for treatment. The washing time should not be too long.

The main reason why the tail of koi fish is rotten is the poor water quality or the change of water temperature, which causes irritation to the fish body, so we must keep the water quality at ordinary times and ensure that the water temperature will not change too much when changing water. In addition, if fish are bitten, they must be kept separately in time.