Amphibians and reptiles of Washington State: Location data and predicted distributions. Volume 2 in Washington State Gap Analysis - Final Report, (K. M. Cassidy, C. E. Grue, M. R. Smith and K. M. Dvornich, eds.), Washington Cooperative Fish and Wildlife Research Unit, University of Washington, Seattle.
Shark found in the Ohio River at Manchester, OH. Early. speculation was that it was a bull shark was incorrect. Now identified. as being an Atlantic Sharpnose. - pic credit: Ledger Independent.
Some can...Bull sharks have been found WAY upriver, and have been known to attack swimmers over 300 miles inland. Don't know why salt-water fish can't live in fresh water, though...I can understand vice-versa, but you'd think salt-water fish would have no problem adapting to fresh.