Blue knife fatigue is effective for some big crucian carp, carp and grass carp. The classic match is floating material+north and south crucian carp+red worm powder+blue knife fatigue+red devil wine+fruit acid.

Blue knife weariness is added less when it is used, which has certain evasive effect on small fish, but it also has certain side effects on big fish. When used, it is best to add a small amount or directly sprinkle it in water to purify the water.