Errew Pier provides boat-launch access to Lough Conn, one of Ireland's premier wild trout fisheries in County Mayo. The lough is notable for never having been stocked, relying entirely on its healthy natural trout population.

Anglers fishing from this access point can target both trout and salmon. Trout fishing picks up in April and peaks during the mayfly hatch in late May and June, with good wet-fly fishing continuing through late August to season's end.

Salmon are taken mainly by trolling from late March through July, with roughly 600 fish landed across the lough annually.