Insects and other foods the trout may be eating:
1.   Blue-winged Olives - mostly Little BWO - Isolated hatches
2.   Mahogany Duns
3.   Midges - hatching in isolated locations
4.   Little Yellow Stoneflies - hatching (Little Summer Stones)
5.   Slate Drakes - hatching
6.   Cream Cahills - hatching in Isolated locations
7.   Beetles
8.   Grasshoppers
9.   Ants
10. Inch Worms
11. Crane Flies
12. Helligramite
13. Streamers - matching sculpin, baitfish and small crawfish

Needleflies (Stoneflies) - Nymphs
The nymphs of the Needle Stoneflies are tiny, slim nymphs that stay hidden
down under and between the small pebbles and rocks on the bottom. The way we
have found them is to simply rake up a inch deep section of bottom sand and gravel
and put it in a white pan. Using a process kind of like you would use panning for
gold, we have always been able to find plenty of them, especially in the headwaters
or smaller streams at the higher elevations in the park. When fully grown, these
nymphs are about a hook size 18.

I am not sure how many of the nymphs are eaten by trout. I do know they are
very plentiful in the small, high elevation streams and my guess is the brook and
rainbow trout eat them as a regular part of their diet. We used our "Perfect Fly"
Needlefly Nymph imitation last year with very good success. It caught trout on each
of the several occasions we tried it in the park. We have only used it during the
hatch period or from about the middle of August until the middle of October.

We fish the nymph without an indicator by adding a small amount of weight (split
shot) about six inches above the fly. We use a short, up and slightly across
presentation and just watch our leader for indications of a take. This way you can
search the bottom at any depth from the shallow end of the riffles to the deeper
sections of the runs.

Copyright 2009 James Marsh