I have been trying to decode the Yough for about three years now. At first I could figure nothing out to fool the rising trout. I caught fish in faster water on streamers and nymphs and even dries, but I wanted a piece of those large risers in the slow water areas. I have managed a few and have managed to miss quite a few, but more often than not, they will somehow determine my imitation is not worthy and let it pass by in favor of the naturals. Like you all, I notice that while the fish will rise, they rarely rise consistently in the exact same area;... however, I do remember one time "being there" as they say when the surface just in front of me exploded with a half dozen or more risers that could no sooner swallow something before they rose again. It was just before dark and while this feeding frenzy was progressing and light was quickly waning, I changed flies at least 5 times to no avail, then on a whim, put on a whitefly spinner and proceeded to catch a nice fat rainbow with just enough time to release him and grope my way to the shore before darkness took over. And, that is why I keep going back.