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.

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)

Kogotus Stonefly Nymph Kogotus Stonefly Nymph

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

8 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.

Male Penelomax septentrionalis Mayfly Nymph Pictures

This is surely the most distinctive-looking species in Ephemerellidae. I like the rugged, spindly look. If mayflies made movies, Penelomax septentrionalis would probably play the supervillain.

Maybe I should take a break and get something to eat.

Ruler view of a Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York The smallest ruler marks are 1 mm.

Dorsal view of a Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York

Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York

Ventral view of a Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York

A hairy mayfly nymph. This gangly, odd-looking nymph is from the rare species Ephemerella septentrionalis

Artistic view of a Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York

This mayfly was collected from the Delaware River in New York on May 13th, 2007 and added to Troutnut.com by Troutnut on May 18th, 2007.

Discussions of this Nymph

Great Photos

2 replies

Posted by Earlfishman on May 19, 2007

Last reply on May 19, 2007 by Troutnut

Jason,

The underwater photos are unreal. What sort of lens are you using on that camera? It is just now occuring to me to ask how many of your pictures on this site are taken through a scope and how many are taken with just a camera?

Earl

Start a Discussion of Nymph