A manta ray

The huge manta ray is often called devilfish.

Manta Ray is a harmless creatures and they have a very short barb that is not very sharp and it is totally harmless, it contains no posion. Stingray contains posion barb but Manta Ray don't. The reason why manta ray are called devil fish is because The name "devil ray" comes from the manta ray's extended fins, which many people think resemble devil's horns.

The devilfish, or manta ray, can be more than 12 feet across.

Devil fish is a common term for the manta ray. A female manta ray swim an average of 10 kilometers (6.2 miles) per hour.