The fish has no scales. The anterior dorsal fin is spiny, and its posterior margin is serrated. The pectoral fins are fan-shaped, and the pectoral spines are longer than the dorsal spines, and the anterior and posterior margins are serrated. The spines are vocalized when active. The dorsal and pectoral spines of the fish have poison glands, making it one of the more toxic of the freshwater venomous fish. Strong burning pain occurs immediately after being stabbed, and often due to puncture caused by lacerations, bleeding, localized swelling, and even cause a fever, the affected area will be up to half an hour to one hour before stopping the severe pain. The fish will often swallow the hook into the pharynx due to the wide mouth and swallowing without regard to the consequences, which makes it difficult to remove the hook. Therefore, fishing for fish how to safely remove the hook, correctly hold the fish to avoid being stabbed by fins, is a practical skill that anglers should master.

First, use your left thumb and middle finger to pinch the dorsal fin. If the dorsal fin is not spread, you can use the method of flicking the fish to make the dorsal fin spread after it is frightened.

Second, then use the index finger to hook the fish's left pectoral fin, the three fingers together that is fixed the fish body so that it can not move, at this time you can often hear the fin spines issued by the crunching sound.

Three, then the right hand can easily remove the hook.