The main lough on the Knock system which runs down to its outlet in the village of Furbo. The system has a conservation limit of over 130 salmon but this seems massive for a system of its size and limited spawning area. As the system is not reaching the conservation limit, it is closed for salmon angling and it is unlikely ever to open as a salmon fishery. There is a nice run of sea trout into the lough and is well worth fishing either from the shore, a tube or from a boat, if available, and on a catch and release basis.
Knockalough can be found by taking the Spiddal – Moycullen road and turning up a side road to the left about 3 miles from Spiddal. There is a locked gate on the laneway into the lough and the key is available when purchasing the day permit. A state fishery licence is also required.
Like many other loughs in the area it has a large stock of small wild brown trout some of which leave the systems to feed along the seashores in the Galway and Connemara area to become the sea trout that come back to spawn in freshwater. Sea trout up to 2lb have been taken in recent years and there is a small run of grilse.
Flies are the normal sea trout / grilse patterns of Butcher, black Pennell, mallard and claret , bibio and the watsons fancy. Best times for sea trout fishing would be months of July, August and September.