The humpback anglerfish' or common black devil, (Melanocetus johnsonii), is a deep-sea anglerfish in the family Melanocetidae, found in tropical to temperate parts of all oceans at depths of up to 2,000 meters (6,600 feet). Its length is up to 3 centimeters (1.2 inches) for males and up to 20 centimeters (8 inches) for females.