Pale Morning Duns
.............................Fly Fishing Yellowstone National Park

Look for the spinners to fall over ripples upstream from the calmer water from which
they emerged. Warm, calm days are the best for large spinner falls. Spinners fall both
in the mornings and evenings. Generally, the spinner falls occur in the mornings during
warmer weather. After they mate over water, the males fall to the water and die. Later,
the females deposit their eggs by flying over the riffles and dipping slightly into the
water. They then fall spent and die.
Like the duns, the colors of the spinners can vary greatly from one stream to another.
Generally, the females have olive/brown bodies and the males have a rusty brown
body. The males are always darker than the females. The wings of both are clear or
Spinners can be difficult to see although the insects may cover the water. If you are not
familiar with the spinner fall, it is possible to be on the water and not even know it is
happening. The trout tend to sip the spinners and although you may see the rises you
may not have a clue as to what the fish are eating. They are very difficult to see even
when there are a lot of them on the water, especially during the low light conditions they
occur under. A skim net will quickly tell you if they are on the water and is the best way
to determine if the spinner fall is occurring.  Look for areas where the spinners
congregate in such as slow water below riffles, seams of current and eddies.

We prefer the spent wing imitations of the PMD spinner. Usually the females actually
touch the water to deposit their eggs but sometimes they drop them from slightly above
the water. The trout may take them while they are depositing the eggs but they are
more likely to eat them after they die and fall spent into the water. The females die as
soon as they have deposited their eggs. It is much easier for the trout to position
themselves downstream from the area they deposit their eggs to eat the spinners than
it is to chase them around the faster water where they deposit their eggs.
Use a very light tippet and make an upstream or downstream approach that best
presents a drag free presentation for the type water you are fishing. Generally, a down
stream presentation is best for smooth, calmer water and an upstream presentation is
best for streams consisting mainly of pocket water. In rough water, you will want to
concentrate on the areas the spinners would congregate in such as the ends of riffles
and runs and the heads of pools.

Coming Up Next:
Pale Morning Duns - Fly Pattern Colors

Copyright 2008 James