Koi fish can heal itself if the injury is not serious, but if the wound is large, the possibility of self-healing is very low. There are two kinds of Koi injuries. The first one is bitten by other fish. It is best to isolate this situation to avoid secondary injuries. It is also possible to rub against some things in the tank. Usually, too sharp objects should not be put in the fish tank. If there are sharp Stone, it is best to take it out as soon as possible.

1. Isolation: After Koi is injured, it should be isolated first. Because it is usually bitten by other fish, and this situation will get worse after injury, isolation can prevent the fish from further injury, thus helping it recover.

2. Change water: General bite will not have serious consequences. As long as you pay attention to change water at ordinary times and keep good water quality, it will recover slowly. Usually, the water should be changed once a week, not too frequently, otherwise it will stimulate the fish body, especially the wound, thus aggravating its illness.

3. Medication: If the wound of koi carp tends to rot after injury, the situation is not optimistic. On the one hand, it is necessary to continue to change water and gradually improve the water quality; On the other hand, it is necessary to take medicine. Usually, yellow powder and other drugs are selected, which are mixed into solution and poured into the fish tank, so as to sterilize and avoid the disease from deteriorating.