Dominion has installed two eel ladders on its Roanoke Rapids Hydro station to allow American eels to continue their journey to their historic habitat in the . Eels are catadromous, meaning they spawn at sea and return to freshwater as elvers to grow. Often elvers cannot reach the parent headwater due to obstructing . Eel upstream migration dam fishpass anguilla ladder eelladder fishway. Ontario Power Generation Cornwall site upgraded the eel ladder. fish pass to eel upstream migration for hight dam.