The head of halibut, also known as opium head, is the head of halibut, a kind of halibut, also known as Hemiptera, Haliotis discus hannai, Hemiptera and so on. In terms of biological classification, flounder belongs to the general name of animals, chordates, kiwis and abalones, and there are 60 species of flounder in the world. Fish is an animal that lives in water and belongs to chordates, vertebrates and fish. It has existed on the earth for hundreds of millions of years and is an important part of aquatic ecosystem. There are 3425 species of fish in the world, including large marine animals such as sharks and whales, and common freshwater fish such as carp and crucian carp. Some fish live in fresh water, such as rivers and lakes, and some fish live in seawater, such as coral reefs and deep sea areas.