.......................  ......Fly Fishing Yellowstone National Park

09/30/09

Catching Yellowstone Trout in Cold Water - Part 9

So far, i have only discussed fishing cold water when no hatches are occurring.
Everything has been to do with getting a nymph or larvae imitation in water that
is moving slowly. Hatches can and do take place in cold water.

Midges can and do hatch in water that is in mid to high thirties, in terms of
degrees Fahrenheit.. Winter stoneflies (of two different families) can and do
hatch in water in the low forties. Some of these are wingless. They look a lot like
ants. If there is snow on the banks and rocks in the stream, you can usually see
the dark adult stoneflies crawling around. Like all stoneflies, these crawl out of
the water to hatch. When they do crawl out of their normal hiding place and
migrate to the banks to hatch, the trout know it. The third type of insects to
hatch in cold water are some species of Blue-winged olives. They can and do
hatch when the water is between forty-five and fifty degrees.

I will discuss fishing each of these hatches starting with midges. The first couple
of years that I fished Yellowstone National Park when the water was very cold, I
ignored the midges. I certainly wasn't in a minority. I think most anglers ignore
them, especially in Yellowstone, even the ones that swear by them in the
tailwater streams. Anglers have very good success with midge imitations fishing
the local Wyoming and Montana tailwaters.

One problem with them is that midge flies are tied and sold that don't even
resemble a midge. Most of the commercially available midge patterns are
colorful and flashy to attract the angler, rather than the trout. If anglers fished
any of these types of flies in spring creeks, for example, they would find the
results would be completely different. Midges are not flashy and colorful. In fact
most of them are dull colors of cream and light greens. There are also red ones
that imitate the blood worms, but even they are dull red.  

There is a factor involved that does add what could be considered flashy, I
suppose. Midge pupae reach the surface of the water to hatch with gas that
provides buoyancy. They can't swim as such. The tiny bubbles from this gas
appears to make the pupae glitter. That is why we add a tiny bit of glitter to our
"Perfect Fly" midge pupae. The peacock herl thorax serves several purposes. It
provides a glitter effect that looks very similar to the air bubbles that accent the
pupae to the surface to hatch. It also imitates the thorax about to split open with
wings very well.

Continued..............

Copyright 2009 James Marsh