TINY BWO SPINNER

About 2 pm on the second day we started noticing a few rises on one good looking stretch of Rock Creek. Up to that point we hadn't seen a single insect, and at first we still couldn't see what they were eating. Then I put my eye down to water level and looked closely, and there they were. The beginnings of a hatch of tiny blue winged olive (Baetis) mayflies, about size 20-22. I didn't have anything that small with me, but we each tied on the closest thing I had, size 18 parachute Adams. That was apparently close enough, because as the hatch and bite increased, we both caught a number of fish on dries. I took some of the duns back to the lodge, but by the time I got around to photographing them the next morning, they had molted to spinners. The body of this male was about 4 mm long.
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