The Bloodworm aims to imitate the larvae of the chironomid midge, which makes a large part of the trout’s diet. They vary in colour from pale green and brown to a bright blood red and live the bulk of their lives in silt tubes but, when disturbed or migrating can move by a sinuous lashing motion. This action is almost impossible to replicate, but by adding a pinch of red marabou as a tail, enough action can be imparted to make an effective imitation. The remainder of the fly is simply translucent red Nymph Glass, which is wound in touching turns along the hook.