The phase fish is what is commonly known as the flounder. Flounder is also known as flat mouth fish, left mouth, partial mouth fish, sandy, tooth fresh, phase fish and so on. Flounder body side flat, long ovoid. The general body length is 25-50 centimeters. Weight 1500-3000 grams. Mouth large, diagonally cleft, two jaws of equal length, upper and lower jaws each with a line of sharp teeth, tail stalk short and high, two eyes are on the left side of the head, eye bulge. Mainly distributed in the western North Pacific. China's Yellow Sea and Bohai Sea yield more, the East China Sea and the South China Sea less. Halibut is one of the marine valuable economic fish, per 100 grams of meat containing protein 19, 1 grams of fat 1, 7 grams of meat, white and tender, can be eaten fresh, but also can be processed and made into canned or salted dried products, in addition to anti-inflammatory and detoxification, strengthening the spleen, beneficial effects such as gas, and its liver can be extracted from cod liver oil.