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

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)

Neoleptophlebia Mayfly Nymph Neoleptophlebia Mayfly Nymph

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington

Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.

10 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.

Help with Mayfly identification

MItroutbum
Posts: 3

MItroutbum on Jun 13, 2008June 13th, 2008, 3:44 am EDT

Hey guys, I am new to the forum, and as of this past October, a new resident to the state of Michigan. I have fished extensively in the SE and learned alot of the insects down there, but now that I am up here I have been seriously confused my the naming of many of the larger mayflies (I am mostly a rookie with insects if you cant tell!)

So......
The one thing thats confusing are what people up here refer to as Iso's. I have seen some reference to these as Slate Drakes and they appear slate gray, where others refer to them as Mahogony Duns and they are a dark brown color. Can anyone explain?? What size and color are the Iso's that I should tie up for the upcoming hatches??

Quillgordon
Schuylkill County, PA.

Posts: 109

Quillgordon on Jun 13, 2008June 13th, 2008, 4:15 am EDT

From this website...... if you missed it!
http://www.troutnut.com/hatch/93/Mayfly-Isonychiidae-Slate-Drakes

Patterns ...........
http://flyfishingconnection.com/patterns/flies/51/Isonychia+nymph
http://flyfishingconnection.com/patterns/flies/295/Isonychia+CDC+Emerger
Cheers....

Flyfishing is a state of mind! .............. Q.g.

C/R........barbless

Freepow
menomonie, WI

Posts: 83

Freepow on Jun 13, 2008June 13th, 2008, 4:17 am EDT

What part of Michigan are you in?

"I fish...because I suspect that men are going along this way for the last time, and I for one don't want to waste the trip..."

MItroutbum
Posts: 3

MItroutbum on Jun 13, 2008June 13th, 2008, 5:44 am EDT

Hmmmm, so the Iso body is a Mahogony type color with slate or dark dun colored wings??

I am living in Grand Rapids and loving it so far, we just got back from the UP and had a great time catching lots of beautiful fish.

Rich

Freepow
menomonie, WI

Posts: 83

Freepow on Jun 13, 2008June 13th, 2008, 8:59 am EDT

Both beautiful parts of Michigan. I grew up in the UP and spent quite a bit of time in Grand Rapids. I never got to fish downstate but I sure enjoy fishing in the UP.

"I fish...because I suspect that men are going along this way for the last time, and I for one don't want to waste the trip..."

Wiflyfisher