Fish belong to CYPRINIDAE, CYPRINIDAE and CYPRINIDAE. Widely distributed and abundant in shallow lakes. The body is flat and oval. The mouth is low and slightly horseshoe-shaped. The quarrel must be very short. The lateral line is complete, with 35~39 scales. Both dorsal fin and gluteal fin have thick spines, and dorsal fin has 15~ 18 fins. The largest body length can reach 170mm, and it is the largest individual in fish.