The body is slender, slightly flat, with a long head and a high body. Kiss tip, big mouth, end position, wide and straight mouth crack. The upper and lower jaws are the same length, and the ends extend backward below the front edge; There is a hard protrusion on the inside of the front end of mandible. No need, the eyes are big, the branchial fissure is big, the scales are small, the lateral line scales are about 100, and the lateral line is complete. The dorsal fin has no hard spines; The pectoral fin, ventral fin and gluteal fin are all very short; The caudal fin is long, deeply forked and pointed at the end. The body is silvery white and the back is gray-black; There are black spots on the lateral line, and there are 2-3 rows of scales above the lateral line, which are connected into a longitudinal black wide band pattern.