The mitten crab - known as the Eriocheir sinesis - is ... The crabs migrate from freshwater to brackish-marine waters, and vice-versa, and have the "potential to disrupt local ecosystems by ...

Subsequently other river catchments including the Humber, Medway, Tyne, Wharfe and Ouse have recorded mitten crab populations. They are the only crab found in freshwater but may be confused with ...