The body is slender and slightly flat. The head is small and slightly conical. This kiss is a little sharp. The mouth is in the end position, and the mouth crack is deep and oblique, showing a horseshoe shape. The upper and lower jaws are almost the same length, and the inside of the mandible is slightly horny, without forming a sharp horny front; The lower lip is narrow and divided into two pieces, indicating smooth mastoid process and interrupted posterior labial groove. There are two pairs of whiskers, which are extremely small. The snout end is less than the vertical lower part of the anterior edge of the nostril, and the mouth end must be close to or slightly beyond the vertical lower part of the anterior edge of the eye. Big eyes, lateral position. The body is finely scaled and irregularly arranged. Hip scales are very large. From the isthmus back to the chest and abdomen, there is no scale. The lateral line is complete and almost straight.

The fin without branches at the end of dorsal fin is weak, and there are 12~25 fine teeth on both sides of its posterior margin. The starting point of the ventral fin is opposite to the starting point of the dorsal fin, and some are slightly forward. The end of the ventral fin does not reach 1/2 of the distance from the starting point of the ventral fin to the starting point of the gluteal fin, and is far from the anus. The anus is located right in front of the starting point of the anal fin. 1/2 where the end of pectoral fin reaches or slightly exceeds the distance from the beginning of pectoral fin to the beginning of ventral fin. The anal fin of sexually mature female fish is longer, reaching the base of caudal fin, while that of young fish and sexually mature male fish is shorter. Tail fin fork

The back of the body is light brown or yellowish brown, and the abdomen is grayish white or slightly yellow; In the reproductive period, the anus of the female body is particularly large and reddish, and the anal fin is long and thick; A well-developed pearl star appears on the kiss of the male body.