Swedish version

CDC Loop Dun
By Goran Grubic

  The situations when trout or grayling feed selectively are rare on most of the freestone rivers. Such rivers are poor in nutrients and fish capture whatever comes along. On the other side, spring fed limestone rivers are rich with insect life and because of that trout are often selective. When selectivity occurs it is important to offer a fly which resembles the hatching insect in some important features.

  Perfect imitation is neither possible to produce with the usual fly tying materials, nor is that really necessary. Fish will take a fly that behaves like natural, and has a right shape, size and color. Tying such a fly does not necessarily take a lot of time. There are dozens of suitable hatch-matching patterns, and here I would like to present one that is tied quite rapidly and serves its purpose quite well, even with very selective high summer grayling. It is actually a small Ephemerid emerger/cripple pattern, which is fishing with its tails and body submerged in the water surface.

  The special quality of this fly is that it uses fibers from only one CDC feather for its wing, and in sizes smaller than 18, just half of the feather would do the job.

  The Blue Winged Olive Loop Dun is given here as an example, dressed on a hook size 16. This species is very common all over Europe and can often be responsible for selective feeding in the summer and early autumn. Other species can be also imitated with this pattern using suitable colors for wings and bodies.

Hook: 16-22, any dry fly model
Thread: Olive Danville 6/0
Tail: Fibers from mallard breast feather
Body: Super Fine dubbing, olive color
Wing: Mallard CDC fibers, natural dun


  Step 1. The tail is attached, roughly as long as the fly body


  Step 2. The body is dubbed


  Step 3. The fibers from one CDC feather are placed in a dubbing loop and spun


  Step 4. The CDC loop is wrapped around the hook shank, secured and clipped


  Step 5. The fibers are combed upwards with Velcro


  Step 6. The thread is moved to the front of the wing and backwards, two times, making “X” wrap under the fly thorax, thus securing the fibers in the upper position


  Step 7. The fly is finished with a whip finish


  Step 8. The wing is clipped to the required size and shape

Text and photos by Goran Grubic



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