....................... ......Fly Fishing Yellowstone National Park
Fly Fishing Yellowstone - Pale Morning Dun - Emergers
The Pale Morning Duns swim to beneath the surface skim to shed their nymphal shucks. They are suspended in a perfect position for the trout to eat them. Trout usually do just that, feeding on them with ease. PMDs emerge in the morning usually from about 9 am to 11am. Like many other mayfly hatches the activity usually last only a short time, an hour or so, although it may go much longer on during cloudy, overcast days.
Presentation: In many cases, the PMD nymphs migrate to calmer, slower moving water that is very near their normal moderately flowing water habitat just before the hatch. We suggest you use a long leader and tippet of 6x or even 7x. You will get better results than you will using something heavier and shorter.
In most all of the situations they hatch, a down and across presentation will work best. If you can single out an individual trout and fish to it, you will be better off than blind casting. We have two types of "Perfect Fly" Emerger flies. One imitates the emerger when it is more nymph than dun. The other one is a trailing shuck version that imitates the newly hatched dun before it has shed its shuck. Either one usually works well.