Hatches Made Easy:

Needle Stoneflies - (Leuctridae Family) - Nymphs & Adults


The nymphs of the Needle Stoneflies are tiny, slim nymphs that stay hidden
down under and between the small 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 panning gold, we discover them.
They range from a hook size 18 to 24.
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
trout eat them. To be honest, we have never deliberately fished an imitation of
the narrow, tiny nymphs so we can not say how effective it would be.

The adults deposit their eggs during the day usually in the afternoons and
probably during the evenings. Fishing an imitation of the eggs layers is almost
like fishing a mayfly dun or spinner. You can use a larger imitation than the
adults because they are always fluttering just above the surface and actually
touch the surface with their wings still fluttering.
There is an amazing difference in the way these stoneflies look flying than they
do when they are not flying. They look much like caddisflies in the air but as you
can see, they are very narrow and long, tiny flies that remotely resemble pine
needles. Flying they look much larger than they actually are. We suspect many
anglers think these stoneflies are caddisflies and a caddisfly imitation may very
well work for the ovipositing females.
Even though these are sometimes called "Black Rolled Winged Stoneflies", they
are mostly dark brown. We have been able to catch trout imitating the egg layers
every time we have tried. We have never seen or tried a specific pattern for the
adults. It is common to see trout eating them on the surface in the fall months. It
seems most of the activity is in the high elevation streams although you will find
them everywhere there is fast water.

Coming Up Next:
Needle Stoneflies -(Leuctridae sp) - Fly Pattern Colors

Copyright 2008 James Marsh