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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.

The Tanana River in Alaska

Stream photos

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Hydropsyche (Spotted Sedge) Caddisfly LarvaHydropsyche (Spotted Sedge) Caddisfly Larva
Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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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.
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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

4
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
5
Brachycentrus appalachia (Apple Caddis) Caddisfly Adult
Lateral view of a Brachycentrus appalachia (Brachycentridae) (Apple Caddis) Caddisfly Adult from the Beaverkill River in New York
5
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
3
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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