Dark Blue Dun
Originator: Danie Erasmus
Hook: #12-18 Mustad 94840
Thread: 8/0 black
Tail: Dark dun hackle fibres
Body: Superfine dark blue dun dubbing
Wing: Dark gray poly yarn or dark blue dun hackle tips
Hackle: Two dark dun hackles
This pattern was developed to imitate this dark gray dun. The flattened head of this specific specimen in the photo above is a clear sign that this species belongs to the clinger mayflies, of which the Heptageniidae family is the most prominent. Not all duns in this family is as dark as this specimen as some species are quite light like the pale yellow body and mottled gray winged Pale Evening Dun.
This fly pattern is also a good imitation of the Blue Quill duns belonging to two crawler mayflies belonging to the Paraleptophlebia and the Leptophlebia Genera.
This particular colour mayfly hatches in many streams in the PG area, most notably the Willow and Bowron rivers.