The many Caddis trout fly
patterns are designed to imitate the caddis in the many stages of
The caddis group forms one of the most important
food sources for trout. It is found in all waterways from fast flowing
streams to stillwaters.
A huge proportion of the diet of trout is the
larva or pupa stage of the caddis though trout will also rise freely
to take the adult caddis as it either first leaves the river or
returns to lay its eggs.
Green Caddis Nymph
Tungsten Brown Caddis
Green Caddis Larvae
Skittery Caddis, Dec 2002
of Fly Fishing Calendars,
© Michael Scheele
After hatching from its egg
form the caddis is in larva form. At this stage it is bottom dwelling.
It is often encased in a hard shell and referred to as a horn-cased
caddis though others in the family are free swimming.
Later the larva becomes a pupa and swims to
the surface where it hatches in its adult form to fly from the river
It returns later to rest on the river to lay
its eggs which sink to the river bed to awaiting the next round
of the cycle.