Common names: Jiujiu fish, sea bream and Fu crucian carp.

Origin and date of birth: distributed in the western North Pacific. China is located in the northern Yellow Sea and Bohai Sea.

The body of Carassius auratus (Carassius auratus) is covered with small and thin round scales. There is a well-developed scale sheath in the spine of dorsal fin, which extends backward to the fin strip; Fin spines can be stored in the groove after being folded. Bright eyes, bright scales and bright cheeks are called three bright. Fresh fish not far from the water has a straight body and does not bend. In the breeding season, there are obvious adenoids on the anal fin of male fish; Fin extension. The hypopharynx is healed, slender and denticulate. Cold temperate coastal fish. The body length is generally160 ~ 230 mm. Viviparous, the uterus of female fish is divided into multiple chambers, and each fetus produces 30 ~ 50 small fish. You can often catch them in the Yellow Sea.