Distribution
Europe: North of the Pyr?n?es and Alps, from Adour (France) eastward to Neman (Lithuania, Russia) drainages, in rivers draining to Atlantic, North sea and southern Baltic Sea; Danube to Dniepr drainages in northern Black Sea basin; southeastern England north to Yorkshire. Found almost throughout Mediterranean drainages of France. Locally introduced in northern and central Italy, rivers Wear, Tees and Medway and most western drainages of England.