Carp is a kind of flounder, belonging to the family Abalone. Squid's body is flat and asymmetrical, and both eyes are on the left; In front of the mouth, the mandible protrudes; The edge of the anterior branchial lid is free; Skin with eyes is dark gray or patchy, and skin without eyes is white. Carp is mainly used for fresh food or canned and pickled products, and cod liver oil can be extracted from fish liver. Japanese flounder is a rare fish in the Yellow Sea and Bohai Sea of China. Like other flounder varieties, it is a famous dish with seasonal flavor, and the cooked dish is bright, spicy and tender. There are many kinds of catfish, which are widely distributed in tropical or temperate oceans and are also produced in coastal areas of China. According to the classification rules of left flounder and right flounder, crow is a kind of flounder, and it is wrong to say that crow is an alias of flounder. The scientific name of salmon is Greenland sole.