Also known as American flounder and southern flounder, they belong to teleost, flounder, suborder flounder, subfamily flounder, genus flounder, belong to deep-sea benthic fishes, and are a large number of flounders in America. The morphology of PARALICHTHYS olivaceus is similar to that of Chinese PARALICHTHYS olivaceus. Its side is flat and oval, and both eyes are located on the left side of the head. The left side of the body is light brown with irregular spots, and the abdomen is light in color, which can change with the surrounding environment to hide the body and avoid enemy damage. Paralichthys olivaceus is a kind of fish in euryhaline, which can usually survive in seawater and fresh water. Females grow faster than males and can reach sexual maturity at the age of two. Usually, the life span of male fish is two years. It is reported that the male fish in South Carolina can live for up to three years. At the same age, the weight of female fish is obviously larger than that of male fish, and a three-year-old female fish can reach about 25 cm. In natural waters, adult fish can grow to 75 cm, and female fish grow faster than male fish. When the second-instar fish reaches sexual maturity, the male fish can reach 20 cm to 25.5 cm, and the female fish can reach 30 cm to 35.6 cm. If artificial breeding is carried out, its growth period is obviously shortened, and its effect is faster and its benefit is better. In natural waters, PARALICHTHYS olivaceus has the ability to ambush and prey. Larvae mainly feed on crustaceans, and with the continuous growth of fish, they gradually feed on various fish, usually including spotted mullet, striped mullet, white mullet, grass shrimp and so on.