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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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.

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.

Penelomax septentrionalis Mayfly Nymph Pictures

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

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

Ventral view of a 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

Where's Taxon or Gonzo?

7 replies

Posted by Oldredbarn on Jan 15, 2010

Last reply on Jan 22, 2010 by Taxon

Now this is one that slipped by me Ephemerella septentrionalis...Look at those long legs! I guess we may say that this bug doesn't qualify as a "Super Hatch", but what does anyone know of it? Has anyone other than Jason ran in to it? When does it emerge etc?

I have been meaning to send Jason a note asking him on how accurate is the color of the naturals he photographs to their true color? Are these their true colors or is something lost in translation?

If this bug exists in any numbers and the color is accurate...A natural pheasant tail would cover it nicely.

When I first started tying the "legs" on my PTN's were overly long...I could use them for this guy.

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