Pseudorasbora parva (scientific name: Pseudorasbora parva) is a fish belonging to the family Cyprinidae and Pseudorasbora parva. The body is slender, slightly flat on the side, the tail stalk is longer, and the abdomen is round. The head is small and slightly pointed, slightly flattened up and down. The kiss is slightly pointed and prominent. The eyes are large and the eyes are wide and flat. The mouth is small, superior, the mouth is almost vertical, and the lower jaw is longer than the upper jaw. 1 row of pharyngeal teeth, tooth type 5-5. Thin lips. No need. The gill rakers are degenerated and sparsely arranged. The body is medium and large with round scales; the lateral line is complete and relatively straight. Each fin has no hard spines, dorsal fin soft 3 (unbranched and soft) + 7 (branched and soft); anal fin 3 (unbranched and soft) + 6 (branched and soft); pelvic fin 1 (unbranched and soft) Soft branches) + 7~9 (soft branches). The dorsal side of the body is silver-gray, the ventral side is gray and white, and the posterior edge of the body side scales has a crescent-shaped black spot. During the breeding season, male fish have obvious snouts to chase stars. Females and juveniles are lighter in body color, with a black vertical band in the center of the side of the body.