Why is koi fish always in the lower reaches of the water and has the feeling of nodding before his tail?

Suffering from parasitic diseases, if there are no symptoms of scurrying around and rubbing the jar, then it should be rotifers that can make koi fish lose his balance.

Related symptoms: mainly parasitic on the body surface and gills of fish, but also parasitic on the head of fish. When a large number of parasites occur, a layer of white material will appear in dense fish. It will make fish lose their appetite, swim slowly, or lose their balance.

Careful observation shows that there are white material on the surface or gill of fish. The epidemic feature of this insect is that it can multiply in large quantities when the water temperature is about 25 degrees from May to August every year.

Treatment: bathe the sick fish with 25mg formalin per liter for 5 to15min, or splash 25mg per liter1.5-2mg in the tank. (Soaking means taking out the fish and soaking it in medicated water for about 10 minutes. It also depends on the size of the fish, which requires experience. The water temperature should be the same as that of a fish tank, and people should not go far during treatment. ).

And 3% salt water immersion 10 minutes.

8 mg of copper sulfate solution per liter for 20 minutes.