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.

Mount Deborah and Hess Mountains. Two of the greatest peaks of the Alaska Range rise behind the braided, glacial Susitna River. These massive mountains are 35 miles north of where I took this picture.

From the Susitna River in Alaska

Stream photos

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Epeorus albertae (Pink Lady) Mayfly Nymph Epeorus albertae (Pink Lady) Mayfly Nymph

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington

This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.

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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.

Light on the dusk flight

Falsifly

Hayward, WI.

Posts: 660

Falsifly on Dec 25, 2007December 25th, 2007, 11:58 am EST

I think some of the more scientifically inclined contributors to this site might find this an interesting tidbit. I came across it during a Google search and decided to forward it here. Up to this point I’ve never given it much thought but it does offer a plausible possibility.
But than again you guys may be way ahead of me on this one.

http://jeb.biologists.org/cgi/content/abstract/207/5/755

Falsifly
When asked what I just caught that monster on I showed him. He put on his magnifiers and said, "I can't believe they can see that."

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Dec 25, 2007December 25th, 2007, 1:14 pm EST

Allan-

That's an interesting theory, which I hadn't heard before. My suspicion is that optimal water detection may be but one of several reasons for the increased insect flight at dusk. In any event, Merry Christmas to you, and thanks for sharing.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com