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Home » Trout fly fishing » Shannon Region »

Lough Derg

OPEN SEASON: March 15th - September 30th

Lough Derg is a large lake of over 30 kilometres in length and is regarded as a mixed fishery. Lake brown trout indigenous to Lough Derg and are well distributed throughout the lake.

While the season opens in March, the height of the angling year is undoubtedly during the Mayfly season. Fish feed ferociously on mayfly and are in prime condition as they leave the lake on their migratory journey up river to their spawning grounds on the Little Brosna/Camcor rivers and other tributaries on the system. Artificial local patterns of the Greenfly and the Spent Gnat Mayfly are fished dry on 6lb line during the Mayfly season which commences in late April/early May. Another popular method is to Dapp the live Mayfly itself or a Golden Olive fished wet to represent the emerging mayfly.

Trolling Rapalas is practiced early in the year with some success. Some very large fish can be caught such as that in the picture featured above.

Angling regulations

 BYE-LAW 949 strictly prohibits:


Trout fishing is free

Other useful information


Access is excellent at a number of points including the following - Co Clare or western shore at Killaloe, Scariff, Mountshannon, Rossmore and Williamstown Harbours, Whitegate, Portumna Bay Co Galway, Eastern shore, Terryglass, Kilgarvan, Coolbaun, Luska Bay and Dromineer


There are a number of Marinas on the shores with slipways.


The Lower Shannon Trout & Coarse Fisheries Development Society develop angling locally in the lower Shannon Region. Anglers can voluntarily purchase a share certificate from most of the larger tackle dealers in the area.

Guides and Instructors in the Shannon Region

Tackle shops in the Shannon Region