Here is the fly pattern sheet for the RiverKeeper Callibaetis Emerger. The fly is designed to imitate the wings pulling out of the nymphal shuck before the dun flies off the water. The fly sits in the surface film.

RK Callibaetis Emerger |
RiveKeeper Callibaetis Emerger Materials |



Daiichi 1310 or TMC 102Y #12 – 16


8/0 rust or tan


Wood Duck fibers


Copper wire – small


Superfine dubbing – callibaetis color


CDC – tan


  1. Attach thread.
  2. Tie in Wood duck fibers for tail.
  3. Tie in copper wire ribbing.
  4. Dub Superfine and wind forward to thorax creating tapered body.
  5. Bring ribbing forward with 4 to 5 wraps.
  6. Tie in 2 or 3 CDC feathers with 2 soft thread wraps. Pull CDC stems to adjust wing length  from 1/2 to a full body length, depending upon desired length.
  7. Whip finish.

Note: Use #12 for early season fishing, #14 for mid-season, and #16 in the fall.

If you’d like more information on CDC, check out my blog – Use Fly Patterns with CDC Feathers

To learn more about the real bugs, visit my blog – Callibaetis Mayflies.

Here is a link to my RiverKeeper Flies YouTube channel where I demonstrate how to tie the fly.

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