Duobao fish (scientific name: Panalichthys lethostigma) is a fish of the genus Scophthalmus in the family Scophthalmus. It is a marine benthic fish belonging to the genus Scophthalmus of the family Scoliotidae of the bony fish class. Commonly known as European flounder, it is called "Duobao Fish" in China.
In natural waters, adult fish can grow up to 75cm. The body is very flat, oblong, oval or long tongue-shaped. Young fish's eyes are on both sides of the body, and adult fish's body is asymmetrical left and right. One eye gradually turns left or right, and 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 long in base, connected or not connected with the caudal fin. Both eyes are on the upward side of the body, and the color of this side is well matched with the surrounding environment; Their downward side is white. There are extremely fine scales on the surface of the body.