From drowned insect to 'emerger'
This page explores how wet flies
have changed over the last 150 years so that they now:
work at various levels in the water column: top, middle and bottom
mimic gasses trapped beneath the insect's exoskeleton which help it ascend
from the bottom before hatching
mimic the bulbous thorax which contains the wing buds
mimic emergence of the adult or dun from its immature form whilst breaking
through the surface film
The sections below describe some important steps in the evolution of the
wet fly from early patterns which represent drowned insects to modern patterns
which cover each stage in an insect's life-cycle.
The page concludes with some speculations on the reasons why trout take
artificial flies. These ideas are drawn from Paul's earlier academic career
which involved research into the stimuli involved in controlling sequences
of animal behaviour.