1. Pleuronectidae; righteye floaters.
 2. It is also a kind of fish. It is a general term for fishes of the family Pleurodidae of the class Osteichthyes.
 3. A class of flatfish.
 4. The body is oval, oval or rhombic, flat on the side, and the tail handle is short and high.
 5. The edge of the anterior operculum is free.
 6. The body is flat and asymmetrical, with both eyes on the right side of the head, and the maximum body length is about 3M.
 7. The mouth is anterior, the mandible is more or less prominent, and the edge of the anterior operculum is generally free.
 8. The eye side is dark brown, and the eye side is white.
 9. It has a wide range of species, mainly produced in temperate and cold zones. It is produced along the coast of China and more in the north.
 10. Common species are Pleuronichthys coenutus, Veraspervariegatus and Cleisthenes herzenstein.
 11. It is an economic fish.
 12. It is edible, and the liver can be used to make cod liver oil.
 13. Flounder is widely distributed in temperate and subtropical coastal waters of the Indian Ocean, the Pacific Ocean and the Atlantic Ocean. Few species live in the Arctic, and some species can swim into harbors and rivers.