Hairtail skin does not need treatment. Hairtail skin is a silvery white substance, a kind of fat secreted by sebum, not a real fish scale. Silver grease usually does not need to be scraped off, because silver grease is a kind of fat without fishy smell, which has certain nutritional value and contains unsaturated fatty acids, lecithin and 6- thioguanine; Moreover, silver grease can ensure the integrity of hairtail cooking and is not easy to break.