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.

Two major forks of this grayling stream come together in this pretty pool.

From the Chena River in Alaska

Stream photos

Featured on the forum

Re: Trico emergers
In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)

Re: Trico Tips
In the Mayfly Genus Tricorythodes by Martinlf

Re: UV spectrum and trout
In General Discussion by Martinlf

Re: closing the gender gap in flyfishing
In General Discussion by Konchu (Smallflyguy replied)

Re: Fishing Kupa River, Slovenia
In Fishing Reports by Slocum (Fish1 replied)

Doroneuria baumanni (Golden Stone) Stonefly Nymph Doroneuria baumanni (Golden Stone) Stonefly Nymph

Dorsal view of a Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Nymph from Sears Creek in Washington

9 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.

Drunella grandis species complex

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on Aug 1, 2019August 1st, 2019, 9:11 am EDT

Ok So I know nothing about western Mayflies, shoot, I hardly know anything about any mayflies, but anyway, I am looking for some insight in separating out D. grandis grandis from D.grandis flavitincta and Drunella grandis ingens. Especially the subimagos. The only literature I have on it only has separations for the imagos ( Allen and Edmunds 1962) and they use forewing coloration. Any ideas?

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Aug 1, 2019August 1st, 2019, 12:42 pm EDT

I'm not aware of any source on that after Allen & Edmunds. I have a few more recent papers pertaining to Drunella, and none of them get into the subspecies of grandis at all.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on Aug 2, 2019August 2nd, 2019, 2:36 am EDT

I'm not aware of any source on that after Allen & Edmunds. I have a few more recent papers pertaining to Drunella, and none of them get into the subspecies of grandis at all.

Thanks Jason, that's all I could find as well.