Flounder, also known as flounder, inhabit shallow, sandy bottoms and prey on small fish and shrimp. They are particularly well adapted to benthic life on the seabed. Due to their flattened body. The eyes are the same on the upward facing side of the body, and the color of this side matches their surroundings well; the downward facing side of their body is white. Flounder have extremely fine scales on the surface of their body. Flounder have only one dorsal fin, which extends from the head almost to the caudal fin. They live primarily in temperate waters and are an economically important fish in temperate seas. How do flounder's eyes come together? As it turns out, flounder hatchlings that have just hatched from their egg membranes do not resemble their parents at all, and look very similar to common fish. The eyes grow on either side of the head. One on each side, symmetrically placed. They live in the upper layers of the water and often swim near their sleep. After about 20 days or so, the shape of the flounder hatchling begins to change. When the halibut larvae reach 1 centimeter in length, something strange happens. The eye on one side of the flounder begins to move. It gradually moves to the opposite side through the upper edge of the head and doesn't stop moving until it gets close to the other eye. Different species of flounder have different methods and routes for moving their eyes. The flounder's skull is made of cartilage. When the flounder's eyes start to move, the cartilage between the flounder's eyes is first absorbed by the body. In this way, there is no obstacle to the movement of the eyes. The movement of the flounder's eyes is a sign that the flounder's internal structure and organs have also changed. The flounder is no longer adapted to a floating life and has to lie across the bottom of the sea. Flounder is a valuable seafood. It is called flounder in fisheries. The body of the flounder is usually 25 centimeters to 50 centimeters long, and the largest flounder is 70 centimeters. Flounder will do short-distance cluster migration according to the change of seasons. Along the coast of China, turbot has a wide distribution. Fishermen in the Yellow Sea and Bohai Sea use bottom trawling nets to catch turbot. Fresh flounder can be eaten or canned. The liver of flounder can also be extracted cod liver oil.