Xiphactinus ("Swift Shark") was a large, prehistoric predatory fish. It was over 20 feet (6.1 m) long and lived in the Late Cretaceous period. Despite its name, it was a teleost, bony fish, this creature was not a close relative of the sharks. It was about 6 meters long and fed on Hesperornis and the occassional Pterosaur.
Xiphactinus lived in the seas of the Late Cretaceous period from 85-65 million years ago. It died out with the dinosaurs at the end of the Cretaceous.
If the Devil kept fish, Xiphactinus would be one of them. They were one grotesque species of predatory fish that measured over 20 feet long and looked more like bulldogs than fish. These fish could also sallow a Hesperornis down whole in one go.