Carassius auratus According to China Fisherman's Network, bait is used in Northeast China, bait is used in North China, and bait is used in Central and South China. In order to improve the effect of attracting fish and promoting food, crucian carp and fish dopa can be added to the bait. Crucian carp (Carassius auratus) is a small drug to lure fish, which has a very favorite fragrance for crucian carp and has a strong ability to collect fish from cultured crucian carp caught in black pits.