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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

A trackless paradise two days deep in the Yellowstone backcountry From Mystery Creek # 218 in Wyoming

Stream photos

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Doroneuria baumanni (Golden Stone) Stonefly NymphDoroneuria baumanni (Golden Stone) Stonefly Nymph
Dorsal view of a Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Nymph from Sears Creek in Washington
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27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Closeup insects by Bnewell from the Big Thompson River in Montana

Male Rhithrogena virilis Mayfly Spinner
2 Pictures
Male Rhithrogena virilis (Heptageniidae) Mayfly Spinner from the Big Thompson River in Montana
Before I reared this specimen the nymphs were unknown. See Western North American Naturalist for the paper on the description of this species' nymph.
Added by Bnewell on June 26, 2011
Collected April 3, 2007 from the Big Thompson River in Montana and added by Bnewell on June 26, 2011

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