The Daddy long legs fishing fly or crane fly is a semiaquatic insect, the daddy long legs trout fly can be found throughout the summer and autumn,most prolific at the end of the summer. Trout will strike at this even when there are no natural daddy long legs available around. With it being a weak flier they are constantly blown onto the water so the daddy long legs flies are a big part of the trouts diet. Equally effective on still waters and rivers.