Will grow out, ichthyosis is one of the common diseases in koi fish. Some of them will have skin ulcers at the same time or later. If you use a recycled ecological fish tank, it is recommended not to pour the medicine into the fish tank casually. Although the problem can be solved quickly, the potion will be absorbed by all the fish. After a long time, the fish may get sick and lose weight.

It is suggested to dilute the water with potassium permanganate powder or solution, put the diluted pink potassium permanganate solution into a clean basin or jar, and then put the sick fish into it (if you are afraid of other fish being infected, you can also put other fish into it at one time).

After ten minutes, take out the sick fish and put them back in the fish tank, which should be improved once a day for 2-3 days. If you are seriously ill, you can stay a few more days.

Extended data:

Check swimming posture

When koi fish is healthy, he will swim in all directions. When he is ill, koi fish will swim alone. When he is seriously ill, he will stumble and even have no strength to stop swimming and even hit the wall of the pool. ?

Koi fish forms a circle in the corner of the fish pond or rubs the wall or bottom of the pond with his body, indicating that parasites have been attached to the fish. In severe cases, koi fish rubs his body, slaps his dorsal fin and pectoral fin, or jumps. If koi fish swims standing on his dorsal fin, it is a sign of nervous system diseases.

Koi fish's winding body is an abnormal signal of koi fish. Staying still on the water is a danger signal. Being unable to stand upright is a state of losing balance. There may be something wrong with the swim bladder, or there may be parasites on the head. When he is seriously ill, koi fish will swim around.