The Green Sedge (Caddisflies)
The Green Sedges, or rhyacophila species of caddisflies, can be important
insects to imitate. This is the most important one of the free-living types of caddisfly
larvae. The larvae do not build cases that they carry with them and they don't even
have temporary shelters to protect themselves from predators. They are available
for trout to eat most of the time.
Green Sedges live in a variety of habitats but for the most part, all species of them
prefer moderately to fast moving water. The riffles and runs of the freestone
streams provide the ideal habitat for these free-living larvae.
The "Rock Worm" or "Green Rock Worm" as some call it, is the common name for
the larva stage of life of these caddisflies and the most popular and most effective
stage to imitate. Trout also eat the pupa stage of the Green Sedge as well as the
egg laying female adults.
The larva stage of life of the Green Sedge can be imitated throughout the season.
The pupa stage is the best stage to imitate during the hatch. The adults stay on the
surface of the water only for a very short time. The egg laying stage is imitated
using the Perfect Fly adult imitation as both a wet and a dry fly. That's because the
females dive to the bottom to deposit their eggs. Some crawl down the rocks and
deposit them. Either way, the egg laying caddisflies resurface and drift away with
There are numerous species of these caddisflies. In any one stream there may be
as many as a dozen or more species of rhyacophila caddisflies. These various
species usually hatch at different times. Some may be prolific and others may be
sparse hatches. If your fishing a pocket water trout stream, you should keep an eye
out for a hatch of the Green Sedges anytime, especially during the early season.
Copyright 2013 James Marsh
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