Copyright 2013 James Marsh
Hatches and Trout Flies for Slate Run Pennsylvania
The first hatches of the year are usually the Little Black Early Stoneflies that hatch in
March. There will also be some Little Brown Early Stoneflies. They hatch for about a
month. Also in March, you will find the first Blue-winged Olives starting to hatch. The
many different species will hatch off and on until early Fall. There will be a peak in
the hatch again in June and then again in late September and October.
April starts the hatches of Blue Quills and Quill Gordons. Both of these mayflies start
to hatch about the same time the water reaches about 50 degrees. The Quill Gordon
hatch last for about a month but the Blue Quills can continue to come off for up to
The first three weeks of May, you will usually find the Hendricksons hatching. These
include the Red Quill, of course. About the same time the American March Browns
will begin to hatch. They will continue through the first week or two of June. Sulphurs
will also start hatching about the middle of May. The hatch can last until the middle of
June. Light Cahills and Pale Evening Duns both start to hatch around the first of
June and continue until the second week of July.
In the slower to moderate flowing sections of water, there will be some Brown Drakes
that start hatching in mid May. They hatch for about three weeks at the longest.
Green Drakes hatch from the same water as the Brown Drakes. It too starts in the
middle of May and last as long as a month. These are not large hatches but they can
be significant in the areas they hatch in.
You will also find the Slate Drakes starting to hatch about the first of June. This hatch
can last for a long time but not in any large quantities. Tricos will hatch in July and
last on into August. These are found in the slower to moderate water.
Caddisflies are also very plentiful in Slate Run. The most abundant species are the
Spotted Sedges and Cinnamon Sedges. These net-spinners are very plentiful. The
different species start hatching around the first of May and continue until early Fall.
Green Sedges are also found in the riffles and runs. There are several other species
of caddisflies, but none are very plentiful.
Terrestrial insects become important about the middle of June and remain a source
of food for the trout through the month of September. Ants and beetles are the most
plentiful but inch worms and grasshoppers can also be important.
We recommend our own "Perfect Fly" imitations not just because we sell them but
because they are the most realistic imitations you can use to match the hatch that
are commercially available. We have imitations of all the important insects.
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Lower Section of Slate Run
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