Header image
Enter a name
Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

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.

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.

Dorsal view of a Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from Cayuta Creek in New York
Posts: 17
Earlfishman on Apr 23, 2007April 23rd, 2007, 3:05 pm EDT
This one looks like an almost ready to emerge male Baetis sp., but I can't be 100% based on the pictures and I definitely can't go any further than that.

As a side note, if anyone is interested in a good key to the larvae of Baetidae, search google for "EPA photographic Baetidae key" and click on the PDF at the EPA site (direct link to the PDF here). The key has some good photos and works very well for the eastern U.S.
Martinlf's profile picture
Palmyra PA

Posts: 3047
Martinlf on Apr 24, 2007April 24th, 2007, 2:14 am EDT
Wow, amazing photos.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Konchu's profile picture
Site Editor

Posts: 498
Konchu on Apr 24, 2007April 24th, 2007, 6:14 am EDT
Could even be a Pseudocloeon/Labiobaetis species...

Earlfishman: Thanks for the link to the great baetid key!!!
Troutnut's profile picture
Bellevue, WA

Posts: 2758
Troutnut on Apr 24, 2007April 24th, 2007, 6:44 am EDT
Excellent link Earl! I'll be using that one a lot.

Following it through for this specimen leads me to Baetis too.

Does anyone have the Baetis species key the PDF mentions as the most recent (Weirsema et al 2004)? Is it worth a trip to the library?
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Konchu's profile picture
Site Editor

Posts: 498
Konchu on Apr 24, 2007April 24th, 2007, 2:52 pm EDT
Worth the trip to the library.

Quick Reply

Related Discussions

Last Reply
Apr 19, 2013
by Sayfu
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy