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.

We were lucky to be able to fish through this storm as it skirted around us to the north, giving us just enough clouds to prompt a BWO hatch but keeping the lighting at a safe distance.

From Slough Creek in Wyoming

Stream photos

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Female Hydropsyche (Spotted Sedge) Caddisfly Adult Female Hydropsyche (Spotted Sedge) Caddisfly Adult

Lateral view of a Female Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Adult from the Columbia River in Washington

7 Recently Added Photos

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.

Now that's aBWO!!

Female Ephemerella excrucians (Pale Morning Dun) Mayfly Spinner

11 Pictures

Lateral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Bois Brule River in Wisconsin

Collected June 30, 2005 from the Bois Brule River in Wisconsin

Added by Troutnut on April 22, 2006

Collected June 30, 2005 from the Bois Brule River in Wisconsin and added by Troutnut on April 22, 2006

Adirman

Monticello, NY

Posts: 479

Adirman on Sep 10, 2010September 10th, 2010, 3:15 am EDT

That Attenuata looks like it truly has the olive body, more so than any BWO pic i've seen yet! Wah tsize would that be tied in to imitate?

Thanks,

Adirman

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Sep 10, 2010September 10th, 2010, 4:31 am EDT

A-man,

The size of A. attenuata is usually around 6-7mm (or somewhere around a #16-18). However, this species is also notorious for creating confusion in fly-fishing literature and getting credit for being a more significant hatch than it probably is. I have some doubts that any of the mayflies pictured in the A. attenuata section are actually that species.

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Sep 10, 2010September 10th, 2010, 4:36 am EDT

Adirman-

The male dun and spinner would have a body length of ~6mm, which would translate to hook size #18, and the female would be slightly longer.

EDIT:

Lloyd,

Oh shoot, we've done it again.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com