“Often enough, the best position for a trout to see and catch these active nymphs is near the river bed”   …….. ”It is useless to try to tempt such a fish with an artificial nymph fished just below the surface, or to cast a dry fly over him”  The words of Frank Sawyer, from the book Frank Sawyer, Man of the Riverside, compiled by Sidney Vines. Frank Sawyer was famous for, amongst other things, The Pheasant Tail Nymph, which you can watch the man himself tying in this link. Sawyer’s book “Keeper of the Stream was first published in 1952.