The sedge’ originates from the fact that adult Caddis flies can often be found clinging to sedge grass near the waters. The Latin name for this group of flies is ‘Trichoptera’. They pass through four stages in their development; egg, larva, pupa and adult.
The eggs hatch into larva in about 10-12 days. The Larvae produce a sticky substance and attach what ever material in on the river bed to their body. This offers protection and camouflage. The pupa stage lasts for several days. The fully formed pupa has middle body legs that it uses to swim to the surface to hatch. Some species choose the shore or vegetation to emerge rather than open water as there they are easy prey for the trout.