Squalidus (Squalidus argentatus) belongs to the order Cypriniformes, Cyprinidae, subfamily Squalidae, and genus Squalidus. Commonly known as: bright shell, bright cover, white-headed whitefish, oily fish larvae, thunder monkey.
The body is long, the front end is almost cylindrical, the abdomen is round, and the head is slightly tapered. The kiss is slightly pointed. The mouth is inferior and slightly horseshoe-shaped. The lip is thin and simple, the lateral leaves of the lower lip are narrow, and the posterior labial sulcus terminates forward at the front edge of the lower lip. There must be 1 pair of mouth corners, which are relatively long and slender, approximately equal to the diameter of the eyes. Big eyes. The scales are smaller. The dorsal fin is short, without spines, and its starting point is closer to the tip of the snout than to the base of the caudal fin. The anus is located approximately in the posterior 1/3 between the base of the pelvic fin and the starting point of the anal fin base. The body is silvery gray, the abdomen is silvery white, and there is a silvery gray stripe on the middle axis of the body side from the upper corner of the gill opening to the base of the tail fin.
This species is a common small fish that likes to inhabit the middle and lower layers of water bodies. It is widely distributed in rivers north of Yuanjiang River in Yunnan, my country. The reproductive period is in May, and it mainly feeds on aquatic insects, followed by algae and higher aquatic plants.
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