Cynodon is a marine migratory fish, which generally lives in seawater of 7-15m, and the deepest can reach 385m. When the body length is 12-15cm, the young fish live and inhabit at a depth of 15-4m, while the adult fish migrate to a deeper habitat with a depth of more than 1m. Feeding on crustaceans such as fish and shrimp.

Agkistrodon is a naked fish, belonging to the genus Cetaceae. Mainly distributed in the Arctic Ocean and the North Pacific Ocean. This kind of fish is a deep-sea fish in cold water area, which has extremely high nutritional value and contains fat, protein and various vitamins. Bare-covered fish was first named "Silver Cod" in the Japanese market because it resembled cod, and its price was much more expensive than real cod. Because of its high nutritional value, it is often used to cook delicious food, which is widely distributed in the sea areas of the world.