Insects and other foods the trout may be eating:
1.    Blue-winged Olives
2  .  Green Sedges (Caddis)
3.    Cinnamon Caddis (mostly Abrams Creek)
4.    Little Sister Caddis (mostly Abrams Creek)
5.    LIght Cahills
6.    Little Short-horned Sedges
7.    American March Browns
8.    Eastern Pale Evening Duns
9.    Sulphurs
10.  Little Yellow Stoneflies
11.  Giant Black Stoneflies
12.  Golden Stoneflies
13.  Streamers (Sculpin, Minnows)
14.  Inch Worms

Yellowstone Opening Day Is Today
The conditions at Yellowstone look great for the coming season, but not for
opening day. All the streams are high and off color and the weather isn't that great
either. The Firehole River is about the only option for catching trout and it will be
tough. The high today will only be about 38 and the low around 26. There's snow
showers occurring in the park. The cold weather has delayed the runoff coming
from melting snow.

Golden Stonefly Nymphs
The Golden Stonefly nymphs are predators. That means they crawl on the bottom of
the stream searching for food which consist mainly of other small insects. They
sometimes get washed into strong currents when they are feeding. The nymphs
take from two to three years to mature, depending on the species.

Like all stonefly nymphs, they crawl out of the water to hatch. Usually they crawl
out on the banks but it can be a large rock or boulder protruding out of the water or
even a limb or log. Usually they move from the fast water riffles and runs to slower,
shallower water in pockets along the banks to crawl out. This means the trout
have a perfect opportunity to eat them when they are migrating to the banks.

Trout tend to feed on them along the banks when the hatch starts probably
because that is the easiest place to intercept them. This means you need to fish
close in along the banks and be careful not to spook trout feeding on the nymphs in
the shallow water.

You can fish Golden Stonefly nymph imitations any time during the year when they
are not hatching. If you choose to do so, then I recommend that you fish a fly about
slightly smaller size of the full grown nymph. There are just as many half grown
nymphs as they are fully grown nymphs at any one point in time.

Fish the stonefly nymphs in the runs and riffles using the "high stickin" method. The
migration to hatch starts occurring very late in the day. I wouldn't start fishing the
nymph imitation any earlier than mid-afternoon. You want to simulate the migrating
behavior with your imitation of the full grown Golden Stonefly nymph.

Cast the fly out into the runs and riffles and bring it back all the way to the bank.
You should stay away from the banks to cast when it is possible to do so to
prevent spooking shallow feeding trout along the banks. If the trees prevent this,
and you are wading, I suggest you use a down and across cast allowing the
fly to swing from the runs and riffles all the way to the bank. You accomplish this
by making a reach cast, reaching out towards the center of the stream, and then
slowly swinging the fly across to the opposite side all the way to the bank.

You will need to add a lot of weight to the fly to keep in on the bottom. If your fly
stays in the very fast water and there isn't any moderate to slow moving water near
the banks, then you are fishing in the wrong type of place. You want to select areas
where there's at least a small area of moderate to slow moving water along the  
bank and fast moving runs and riffles out in the stream. The fly should stay on
the bottom, not mid-depth or near the surface.

"Perfect Fly" Golden Stonefly Nymph

2011 James Marsh