The term 'devilfish' is used to refer to several species of large, predatory marine animals. These include octopi, MANTAS, rays, and octopuses. The most common species of devilfish are the MANTA RAY and the giant Pacific OCTOPUS. The MANTA RAY is a large, flat-bodied fish with two long, wing-like fins that can reach up to 7 meters in length. The giant Pacific OCTOPUS is the largest species of OCTOPUS, reaching up to 4 meters in length. Both species are found in tropical and temperate waters around the world. The term 'devilfish' is also sometimes used to refer to the seabat, a small, bottom-dwelling fish found in shallow waters.