The Crippled Dun our most successful hatch-making fly on the South Island rivers. It imitates an emerging mayfly trapped in the nymphal shuck and is fished dry in the surface film. A Zelon shuck to match the colour of the nymph's skin with body, wing and hackle colour chosen to match the emerging adult.
This pattern is from the vice of Craig Matthews at Blue Ribbon Flies in West Yellowstone, Montana.
An alternative sparser approach to the trapped emerger concept is the Sparkle Dun. The upright elk hair wing and dubbed body are finished by the addition of a Zelon shuck. Zelon is used for the shuck in both flies for its translucency and sparkle that imitates the appearance of the natural shuck.
This pattern is also from the vice of Craig Matthews.
A heavy, fast sinking pattern, the Deep Caddis Pupa has an iridescent flashback over a dubbed body of sparkle yarn. Wire ribbing strengthens the fly and provides segmentation of the abdomen. The dubbed thorax is covered by a feather fibre wing case and the fly is finished with dyed partridge hackle fibres for the tail.
This Dean Bell pattern caught our biggest NZ brown trout at 9Ibs.

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