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There was a great variety of fish present during the Cretaceous Period in Manitoba. Many of them are known only from tooth remains, but vertebrae are also common finds.
Among the Cretaceous fish is found the bulldog tarpon, Xiphactinus. This species had a blunt head and jaws set with sharp teeth, making it look much like a bulldog. It could reach a length of up to 15 feet and could weigh 500 to 600 pounds. It fed upon smaller fish and the young of marine reptiles. Another tarpon fish was the smaller, Gillicus. These and the many other species of fish provided food for the marauding carnivorous reptiles.