Lough Derg is noted for its large population of wild brown trout which inhabit its waters. The trout season opens in March and closes the end of September.The hight of the season comes from the end of April to the middle of June when the large hatches of Mayfly encourage the fish to feed on the fly.
Best flies for this time would be various mayfly patterns and also live mayfly can be dapped when conditions permit. At other times during the season fish can be taken while trolling using Lane Minnow baits ( a favourite with local anglers ) and also with various Rapala baits. For those seeking the elusive Ferox trout slow deep trolling using dead baits can often yield results.