The Ice Age did leave charr in several Irish loughs destined to become in Ulster. To save any unfortunate Donegal border incidents, and because I don't want to put any undue pressure on that area's very fragile charr stocks, I suggest 'stuart m' motors up the M6/M54 to Shropshire's Cound fishery where charr aplenty are stocked. A Forum search will find several threads on charr there
.