The name of opium fish head is actually called marlin, also called flounder. Paralichthys olivaceus is the scientific name of yellow croaker, which belongs to Abalone family and is a kind of flounder. Because its eyes are born on one side, it is also called "flounder". The real name of toothfish is Alaska halibut. Why is there the name "tooth piece" evolved from "flounder"? In many places, flounder with eyes on the left side is also called "flounder", which is formed through the trade of fishermen's southern accent and northern accent. In contrast, the northeast region (note: Jiaodong Peninsula is also called this way) is called "tooth fish", while the surrounding areas of Sichuan, Zhejiang and Guangzhou are directly called "cuttlefish". This kind of fish is produced in the border area between China and Russia, which is commonly called "yuppie". It is rich in gum and tastes good.