Grass carp; Buji fish
There is a good bait for crucian carp, but it generally needs processing.
Generally, corn flour needs to be heated and fried. Never add oil or paste. Stir-fry until slightly discolored and fragrant. It can be mixed with cooked soybean powder for better effect. Simple corn flour can't be used as bait, because the viscosity is not enough, and the state and taste are similar, so it should be used with other bait. I'll give you a prescription: 4 parts of chicken feed +3 parts of cooked corn flour +2 parts of cooked sweet potato+1 part of millet soaked in wine. It's good to catch carp and crucian carp, but not ideal to catch grass carp.
Corn flour can also be steamed with white flour and soybean flour, which can be used as bait or nest. When it's made, it's as big as a nest, and it's covered with white wine made of grain. It is better to ferment for 3 or 4 days with sealed bags, because grass carp also like the problem of grain fermentation, especially grass carp.