The finless porpoise is a non-toxic breeding animal and a national second-class protected animal. The country does not allow eating. Puffer is a kind of fish, but it can be eaten with caution. It is best to breed puffer fish artificially. This kind of puffer fish has the lowest toxicity, and the average consumption of 1500 puffer fish is dangerous and expensive. The toxin in puffer fish is marine toxin, and its molecular formula is C 165438. Colorless prismatic crystal. Unstable to heat. Insoluble in water, soluble in weak acid aqueous solution. It is easy to decompose in alkaline solution and unstable in low pH solution. Tetrodotoxin is a strong neurotoxin, and extremely low concentration of tetrodotoxin can selectively inhibit sodium ion from passing through nerve cell membrane. Tetrodotoxin has other pharmacological effects and is a useful tool for neurophysiology and muscle physiology research.