Stoneflies 101:

This is a brief overview of the stoneflies. Like the mayflies, stoneflies undergo
incomplete metamorphoses. Again, this simply means they start life as an egg,
change to a nymph and finally an adult. You will see shorty that caddisflies and
midges have another stage of life - the pupa.

Stonefly Nymphs:
Most of the stonefly nymphs are clingers but there are others called sprawlers.
Like the clinger mayfly nymphs they spend most of their life down between and
underneath rocks. For the most part, they are not available for trout to eat until
they move to the banks or crawl upon rocks to hatch.

All of the stoneflies that are important to anglers crawl out of the water to hatch.
They do this on the bottom of the stream.  During this time they are subject to
being eaten by trout. This is when the nymph imitation is most effective.

Stonefly Adults:
When the nymphs crawl on the bank or upon a rock, they emerge into adults.
The adults quickly fly off into the bushes and other stream side vegetation. The
stoneflies mate and do not return to the water until they deposit their eggs or
otherwise accidentally get into the water. Some of the stoneflies drop their eggs
from the air but most of them actually dip to the water to deposit their eggs. This
is when we imitate the female adults.
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