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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

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.

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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Millcreek has attached these 7 pictures. The message is below.
Female (left) and male (right). 5.5 - 6 mm.
Female. 6 mm.
Female. 6 mm.
Male. 6 mm.
Male. 6 mm.
Male. 6mm.
Healdsburg, CA

Posts: 344
Millcreek on May 21, 2015May 21st, 2015, 12:25 pm EDT
Adults and larvae were identified using "What is Capnia umpqua? Frison (Plecoptera: Capniidae) distribution and variation of terminalia" by Baumann and Stuart.http://illiesia.speciesfile.org/papers/Illiesia05-05.pdf as well as "Larvae of Five Species of the Winter Stonefly Genus Capnia (Plecoptera: Capniidae) From California, U.S.A." by Stewart, Drake and Stark. http://illiesia.speciesfile.org/papers/Illiesia07-18.pdf

Larvae were found in shallow water 2-12 inches deep. They were found in riffle areas and crawled out on rocks to emerge. They were present from January through March.

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