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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.

Waterfalls over smooth bedrock above Titcomb Lakes From Titcomb Basin in Wyoming

Stream photos

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Re: Trico emergers
In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)
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In the Mayfly Genus Tricorythodes by Martinlf
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Setvena wahkeena (Wahkeena Springfly) Stonefly NymphSetvena wahkeena (Wahkeena Springfly) Stonefly Nymph
Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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.

Updates from May 7, 2005

On-stream insect photos by Troutnut from the Beaverkill River and in New York and

The Beaverkill River in New York
I found this little Paraleptophlebia dun along a Catskill stream, but not enough of her brethren were emerging to get the early-season trout to rise. From the Beaverkill River in New York

Closeup insects by Bnewell from Yellow Bay Creek in Montana

Rhyacophila (Green Sedge) Caddisfly Larva
2 Pictures
Rhyacophila (Rhyacophilidae) (Green Sedge) Caddisfly Larva from Yellow Bay Creek in Montana
Added by Bnewell on June 27, 2011
Collected May 7, 2005 from Yellow Bay Creek in Montana and added by Bnewell on June 27, 2011
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Updates from May 6, 2005

Photos by Troutnut from the Beaverkill River and the West Branch of the Delaware River in New York

The Beaverkill River, Cooks Falls Pool in New York
The Beaverkill River, Horton Bridge Pool in New York
A tributary on the left approaches the large Catskill river on the right. From the West Branch of the Delaware River in New York
The West Branch of the Delaware River in New York
A swift tributary of a Catskill trout stream slides down its own high delta of boulders and cobble. From the Beaverkill River, Horton Bridge Pool in New York
The West Branch of the Delaware River in New York

Closeup insects by Troutnut from the West Branch of the Delaware River and the Beaverkill River in New York

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Male Ephemerella subvaria (Hendrickson) Mayfly Dun
Lateral view of a Male Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the West Branch of the Delaware River in New York
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Brachycentrus appalachia (Apple Caddis) Caddisfly Adult
Lateral view of a Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the Beaverkill River in New York
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Female Paraleptophlebia (Blue Quill) Mayfly Dun
Lateral view of a Female Paraleptophlebia (Leptophlebiidae) (Blue Quill) Mayfly Dun from the Beaverkill River in New York
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Male Epeorus pleuralis (Quill Gordon) Mayfly Dun
Lateral view of a Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Dun from the Beaverkill River in New York
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Perlodidae (Springflies and Yellow Stones) Stonefly Adult
Dorsal view of a Perlodidae (Springflies and Yellow Stones) Stonefly Adult from the Beaverkill River in New York
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Female Ephemerella subvaria (Hendrickson) Mayfly Dun
Lateral view of a Female Ephemerella subvaria (Ephemerellidae) (Hendrickson) Mayfly Dun from the West Branch of the Delaware River in New York
3
Female Paraleptophlebia (Blue Quill) Mayfly Dun
Lateral view of a Female Paraleptophlebia (Leptophlebiidae) (Blue Quill) Mayfly Dun from the Beaverkill River in New York
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Updates from May 3, 2005

Photos by Troutnut from Salmon Creek in New York

Photo by Elena Vayndorf. From Salmon Creek, Ludlowville Falls in New York
My girlfriend holds her first trout up. The photo's blurry because the lens is covered with mist from the waterfall. From Salmon Creek, Ludlowville Falls in New York
My girlfriend prepares to cast into a deep waterfall pool. From Salmon Creek, Ludlowville Falls in New York
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Updates from April 30, 2005

Closeup insects by Bnewell from Grizzly Creek in Montana

Dolophilodes aequalis (Medium Evening Sedge) Caddisfly Adult
2 Pictures
Dolophilodes aequalis (Philopotamidae) (Medium Evening Sedge) Caddisfly Adult from Grizzly Creek in Montana
Added by Bnewell on June 30, 2011
Collected April 30, 2005 from Grizzly Creek in Montana and added by Bnewell on June 30, 2011
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Updates from April 15, 2005

Photos by Troutnut from Willowemoc Creek, the West Branch of the Delaware River, and the Beaverkill River in New York

Willowemoc Creek, Powerline Pool in New York
The West Branch of the Delaware River in New York
The trout streams of the Catskills are often beautiful and clear, but unlike spring creeks they are prone to dramatic flooding at times. This picture shows flood-swept vegetation fifty yards from and several feet above the normal channel. From Willowemoc Creek, Powerline Pool in New York
Distant anglers dunk worms outside a small Catskill town at the meeting of two great trout streams. From the Beaverkill River, Junction Pool in New York

On-stream insect photos by Troutnut from the Beaverkill River, the West Branch of the Delaware River, and Miscellaneous Wisconsin in New York and Wisconsin

Caddis on Catskill cobble. From the Beaverkill River in New York
Many beetles of this species were jumping around the rocks like popcorn on a mid-April afternoon. I'm sure they end up in the water for the trout at times. From the West Branch of the Delaware River in New York
An ant struggles to escape the surface of a Catskill stream. The black dot on the right is the ant's shadow on a rock on the bottom. I can see how this would appeal to a trout. Even I kind of want to eat the thing. From the Beaverkill River, Horton Bridge Pool in New York
This spider lives in the rocks streambed of a Catskill trout stream. From unknown in Wisconsin
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