Why the 20 incher fly pattern belongs in your fly box
If you've spent much time nymphing deep runs, you've probably heard someone rave about the 20 incher fly pattern. It's one of those flies that just looks like "fish food" the moment you see it in a fly box. There's no fancy foam or high-tech synthetic flash—just a whole lot of peacock herl and pheasant tail that seems to drive trout absolutely crazy. I remember the first time I tied one on; I was a bit skeptical because it looked a bit like a messy version of a Prince Nymph, but three casts into a fast riffle, a solid brown trout proved me wrong. ...