The opium fish is not made of opium, in fact its real name is toothfish. For the opium fish is the toothfish alias is wrong. The scientific name of the opium fish is Greenland flounder. It has a row of teeth around its mouth and a flaky body. The origin of the name can be explained in two ways: one is because of the way it swims, always lying flat in the water, leisurely and relaxed, as if it had taken opium. The second is that it is actually known as the "flake fish" because its meat is so flavorful that it is unforgettable in the mouth. I would like to eat again.