BH Pheasant Tail
The Pheasant Tail nymph is probably the fly that catches the most trout overall of any fly. Probably the best mayfly nymph imitation invented. A very versatile fly anywhere, be it lake or river. A general imitation often fished dead drift or using the induced take method. Fish it like a dry fly in the surface if you have problems with fish not taking dry flies as it imitates a large variety of nymphs living in rivers and lakes. It has certainly survived the test of time being invented by Frank Sawyer.