The vast waters of Lough Mask, in County Mayo, contain some of Ireland's largest brown trout. These waters, although noted internationally as game fisheries, provide some pike and perch fishing for the coarse angler.
The Robe River rises near Ballyhaunis in County Mayo and flows past Claremorris, Hollymount and Ballinrobe to enter Lough Mask. The river holds a moderate stock of wild brown trout.
Lough Carra, situated south of Ballintubber, is a limestone lake of around 4000 acres. The lake is very popular with anglers and has an excellent stock of brown trout that average one and a half pounds.