Eel catfish (commonly known as catfish) often live in groups on reefs, estuaries and open coastal areas. When encountering foreign enemies, they often form a ball called "catfish ball" for protection. The spines of the dorsal fin and pectoral fin of the catfish are serrated and have poisonous glands. They are extremely painful when stabbed and are dangerous fish. Nocturnal habit, feeding on small fish and shrimp.