Ancient sharks migrate to lay eggs

Paleontologists from the University of Michigan reported gathering fossil evidence more than 300 million years ago, showing long-billed shark shark Bandringa that migrated from freshwater marshes to tropical shores to spawn .

UPI news agency quoted Professor Lauren Sallan that the journey into the sea to reproduce and shark to return to freshwater environment is very rare.

The extinct Bandringa shark , identified by scientists as having a half-body muzzle, is nearly 3 meters. The Bandringa shark genus discovered in 1969 is thought to have two different species, one living in the river, the freshwater marsh and the second species living in the shallow sea. However, when studying more closely 24 fossils found in northern Illinois, two scientists Sallan and Michael Coates at the University of Chicago concluded Bandriga has only one species. They move to different living locations in ways that are adapted to the environment in freshwater, brackish water and saltwater.

At the time of breeding during the year, Bandringa fish moved to the tropical coast to lay eggs while the males were still in freshwater marshes.