electric ray

Any of a family of sluggish, bottom-living marine rays, widespread in tropical to temperate seas; body disc rounded, skin smooth, tail robust; well-developed electric organs produce strong shocks to stun prey; also called torpedo rays; includes large N Atlantic species, Torpedo nobiliana; length up to 1·8 m/6 ft. (Family: Torpedinidae.)

Electric rays (order Torpediniformes) are fish that have a rounded body and a pair of organs capable of producing an electric discharge, varying from as little as 8 volts to up to 220 volts depending on the species, which is used to stun or kill prey.