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.

Sunlight perfectly strikes the trees at a bend in the Foss River in the Washington Cascades.

From the Foss River in Washington

Stream photos

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Female Skwala (Large Springfly) Stonefly Adult Female Skwala (Large Springfly) Stonefly Adult

Lateral view of a Female Skwala (Perlodidae) (Large Springfly) Stonefly Adult from Mystery Creek #308 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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

15 these mayflies closed a bridge in Pennsylvania - What are they?

KennyBruin has attached this picture to aid in identification. The message is below.

News reports said there were piles of these mayflies two feet deep in Wrightsville, PA.

KennyBruin

Posts: 3

KennyBruin on Jun 17, 2015June 17th, 2015, 7:14 pm EDT

I am not much at identifying bugs. I read about a humungous hatch of these mayflies that closed a bridge over the Susquehana River in South Central PA. (at this point the river is smallmouth water, not trout water) Can anyone identify them for me? Thanks in advance.

Jmd123

Oscoda, MI

Posts: 2474

Jmd123 on Jun 17, 2015June 17th, 2015, 7:40 pm EDT

Kenny, see the thread entitled, "Epic Mayfly emergence" for the opinions of the gang on here. BTW, smallies take these just like trout do!! On Cooke Pond here on the Au Sable River system, I am told that even walleye will rise to a dry during this hatch!

Jonathon

No matter how big the one you just caught is, there's always a bigger one out there somewhere...

KennyBruin

Posts: 3

KennyBruin on Jun 17, 2015June 17th, 2015, 7:48 pm EDT

Sorry for the double posting and thanks for pointing me to the "Epic Mayfly" thread.