Spinibarbus-a hedgehog-like fish that lives in deep-sea coral reefs, has a special body structure and an air tip that expands backward into a band under the intestines. When in distress, it will open its mouth to inhale air or a lot of seawater, and then its head and abdomen will swell up and its thorns will stand up. And its enemies have no choice but to give up this prickly delicacy, because from any direction, their mouths are bound to be pricked by the hard thorns of the spiny dolphin. After the danger is over, the spiny dolphin will expel air or seawater from the gill holes and mouth to make the body return to normal. The spiny dolphin fish like a hedgehog is safe to eat without poison. It is delicious and fresh, and the prickly skin can also be used as medicine to treat nephritis. It is a good food for health. Seafood shops in Sanya are very expensive, and there is also a local person commonly known as Sanya: "tigerfish". Like other squids, they feed on crustaceans, shellfish and young fish.