Flat fish, scientific name pomfret, is a kind of marine fish with flat body. Because the thorns are few and the meat is tender, it is very popular with people, and housewives are also happy to clean it up. It also has the nutritional characteristics of marine fish: rich in high protein, unsaturated fatty acids and various trace elements. Pomfret, collectively known as pomfret, is also called mirror fish locally, belonging to pomfret suborder, pomfret family. Generally speaking, pomfret is 85 ~ 260 mm long, short and tall, extremely flat, slightly rhombic, with a slightly inclined mouth, no ventral fins and a deeply forked caudal fin. The lower leaves are longer than the upper leaves and look like swallowtails. The body is silvery white, the upper part is slightly yellowish gray, the round scales are very small, and most scales have tiny black spots. Pomfret is a pelagic fish, widely distributed in the East China Sea, with a large number, and also distributed in the Yellow Sea and Bohai Sea.