Flatfish, also known as sole, is a general term for abalones. The body is very flat, rectangular, oval or long tongue-shaped, up to 5 meters long, and the adult fish body is asymmetrical left and right. Both eyes are located on the left or right side of the head. The mouth is slightly prominent. Fins are generally spineless. The dorsal fin and the anal fin are longer at the base, and are connected or not connected with the caudal fin. Widely distributed in warm and hot seas of various oceans, it mainly feeds on benthic invertebrates and fish. There are more than 540 species in the world, including China 120 species. The main species are Siniperca chuatsi, Siniperca chuatsi, sole and sole, all of which are economic fish. [1] lives on the sandy bottom of shallow sea and preys on small fish and shrimp. They are especially suitable for benthic organisms on the sea floor. Because their bodies are flat. Both eyes are on the upward side of the body, and the color of this side matches well with the surrounding environment; Their downward side is white. Flatfish has extremely fine scales on its body surface. The flounder has only one dorsal fin, extending almost from the head to the caudal fin. They mainly live in temperate waters and are important economic fish in temperate waters.

Flounder-"chameleon" is a strange fish with two eyes on one side. That two fish should walk side by side, hence the name. It is a large class of marine fish, including catfish, sole family and sole family. PARALICHTHYS olivaceus, PARALICHTHYS olivaceus and PARALICHTHYS olivaceus are common fish in the family PARALICHTHYS olivaceus. Common halibut families include halibut, halibut, halibut, halibut and halibut. "Cynoglossus" is common in Cynoglossus. There are 3 suborders, 9 families, about 1 18 genera, 538 species. There are 3 suborders, 8 families, 50 genera 134 species in China. They are all bottom marine fish, and their distribution is closely related to the environment, such as ocean current, water and water temperature. For example, in the west side of the equatorial ocean, the warm current is very wide and there are many kinds; There is a strong cold current along the coast of the Yellow Sea and Bohai Sea, and there are many types of cold and warm. The western Pacific and the South China Sea were not strongly affected by the ice age, and there were many kinds. There are a few species in China, such as Silurus meridionalis, Cynoglossus altissima and Cynoglossus punctatus, which can live in fresh water areas of rivers.