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

07/19/09

Fly Fishing Yellowstone - Little Brown Caddisflies

There are some Little Brown Caddisflies that show up on just about every
stream in Yellowstone National Park that can be important, particularily when the
hatches are heavy and there are few other insects for the trout to eat. Most of
the Little Brown Caddisflies found in the park are the
Lepidostoma pluviale
species but there are many other species. They are all very similar so knowing
the species is of no real importance. You can distinguish them from most of the
Hydrosyche caddisflies, or Spotted Sedges, because they are much smaller.

This little caddisfly is usually overlooked because it usually does not show up in
quantities that overshadow the more popular Spotted Sedges. However, they
can be found in large numbers and the trout will eat them just as readily as the
larger
Hydrosyche species. The females are a hook size 18 and the male a 20.

The Little Brown Caddisfly is a cased caddis that hatches in the evenings over a
long period of time. You will find these caddisflies just about all summer long on
most all the streams in Yellowstone National Park. Although they hatch mostly in
the evenings, trout can be taken on imitations of the pupae late in the afternoon
and early evening. They hatch out in the stream by swimming to the surface.
The adults ride the surface a few seconds before flying away. Trout can also be
taken on a dry imitation of the adult during the hatch. Egg laying usually takes
place in the late afternoons and continues on into the evening. This provides
another dry fly opportunity. The female adults actually ride the surface of the
water for a short period of time when depositing their eggs, so the egg layers
offer a very good opportunity to catch trout.
























This is our
"Perfect Fly" Little Brown Pupa

Copyright 2009 James Marsh