#Color me yellow free
The nymph swims to the surface, its shuck splits open, and the dun wiggles free and pops up on top of the water. Most mayflies emerge from nymph to dun in the surface film. One of the confusing yet most important aspects of success during a PMD hatch is understanding how they emerge. As a result it’s much easier to miss the hatch on a bright day, by not being in the right place at the right time. Also cloudy overcast conditions generally create a daily hatch that lasts much longer - say two or three hours long - than you’ll find on a bright sunny day when the hatch will last just an hour or two at most. Hot weather will drive the hatches to late morning, while cooler weather will push it into the afternoon.
#Color me yellow driver
Weather is the big driver of daily hatch timing. But it is just as likely that their hatches won’t start until one in the afternoon or even later. If they hatch in the morning it will usually be late morning, say around 11 o’clock. The time of day you’ll find them emerging can be a bit unpredictable, however. That’s a long time, and it should give you plenty of opportunity to get on a stream while their hatches are coming off. early June, and last well into the middle of July.
Ever wonder why a size 16 or 14 hare’s ear nymph works so well? Because of PMD nymph abundance, widespread presence, and frequency in stream drift, I have found fishing nymph patterns that match them one of my most consistently successful patterns for nymph fishing. This is one reason why PMDs are found in so many different types and sizes of streams. Nymphs prefer moderate to slow currents and find a wide range of substrate to their liking, with small to moderate gravel/cobble mix, to small gravel and sand, to beds of aquatic plants and moss all acceptable. Thus, while they may crawl along the bottom they also move around and regularly get into stream drift where they are seen by trout. Though known as crawlers PMD nymphs swim surprisingly well, almost as well as the speedy little blue-winged olive nymphs. This means nothing to the trout, or the flies you use to match them, so you can now forget it ever happened! There’s been a bit of debate about just what species lives in western streams and taxonomists recently changed the species name from Ephemerella inermis to Ephemerella excrucians. PMD nymphs are known as crawlers, and belong to the important family Ephemerellidae and genus Ephemerella. They are abundant, widespread in all types of rivers from small spring creeks to big tailwater rivers, emerge slowly enticing trout to feed on them (more on that in a bit), and their hatches are fairly consistent for three to six weeks, which means if you miss them one day you should find them still hatching the next. Pale morning duns rank right up their with blue-winged olives in terms of characteristics that produce great fishing. I guess that just proves you can never trust a common name. I say misleading because they aren’t always pale and they don’t always show up in the morning. One of these hatches is the mayfly somewhat misleadingly called the pale morning duns or PMDs.
In fact over the next month and a half some great hatches will be happening, hatches that produce as good or better surface activity as the big stoneflies. Don’t despair and think good dry fly fishing is over. Okay, so the salmonflies and golden stones are almost done for the year.
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