It is a warm-water and warm-water bottom fish, distributed in tropical, subtropical and temperate waters of various oceans. Often live at the bottom of the coastal continental shelf, and some species live in the deep sea. Often half buried in the sand and mud at the bottom of the sea, the mouth is exposed, lurking motionless, and the first fin spine is specialized into a bait-like kissing tentacle, swinging in front of the mouth to prey on fish. They mainly prey on grouper, bream, ray and tiger fish. And eat shrimp. 600 ~ 900 mm long? ? ? ? Can swim to the surface to hunt waterfowl. ? ? ? ? The most striking feature is the first hard spine of dorsal fin. This hard spine is shaped like a fishing rod, with a kissing tentacle at the end and a derivative at the top of the tentacle, which acts like a bait. In addition, the body disguised by the racket, called the bait ball, can attract other kinds of small fish or shrimps to come for food and then swallow them unexpectedly. ? ? ? ? Distributed in the Arctic and the three oceans of the world, it is a fish with high economic value in many countries.