My koi fish hasn't moved much recently, and even seldom eats.

Taking a photo can better diagnose the disease, dear!

First, try to mix salt water at the ratio of 1:25, and put the fish in 10-20 minutes, which can't exceed 30 minutes at the longest, otherwise the fish will die.

You can also try to soak 10 for 20 minutes with yellow powder (the proportion described on the outer packaging).

I remember there is something called insecticide, which is special for fish and can kill parasites on fish. . . . You'd better ask the shopkeeper who sells fish. . . . .

See if there are any wounds on the fish, which will also affect the fish! If there is, take out and disinfect the wound with iodine or potassium permanganate and raise it separately!

Change the feed, stale feed will also lead to this! Or use living materials (earthworms), water temperature and quality can be! The water should be kept at room temperature for at least 2 hours before use, which can remove a gas in the water and make the water temperature closer to room temperature, which is very good for fish!

Well, I hope these will be useful to you. After all, I also raise koi fish. Well, it doesn't grow very fast. =

I hope your fish is healthy, it's a feng shui fish!