During its life cycle, every aquatic insect goes through a series of
changes in its form as it develops from the egg to the adult. The
biological term for this process is "metamorphosis." These
various insect "stages" are critically important to the food chain for
the fish that
inhabit the same waters as the insect. Hence, they are of interest to the
fly fisher who attempts to imitate these various stages of insect life with flies that suggest to
the fish that the "bait" on the end of the line is a "natural" insect.
There are 2 types of insect metamorphosis: "Incomplete"
& "Complete"
"Incomplete" metamorphosis
. . .
the stages in an incomplete metamorphosis are: