THE YAKIMA RIVER PMD HATCH
The Yakima river PMD's (Pale Morning Duns) will start their daily emergence around 11:00 a.m. and get thicker into the hour. The hatch will last about 4 to 5 hours, but the fish will remember them well into the evening.
The PMD nymph lives in logs, rocks and vegetation.
Coloration varies considerably from stream to stream; and may vary from week to week on the same stream. If you wonder why your PMD pattern isn't working well, you may want to take a close look at the color of the actual PMD that may be hatching at the present time.
This hatch will last well into the month of June. I recommend a Waterwisp PMD for the hatch. We have been using this with great success. I have had them refuse other PMD patterns that we have offered them, but the Waterwisp PMD has been remarkably producing some nice fish.