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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.

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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.

Female Siphlonurus (Gray Drake) Mayfly Spinner Pictures

Egg-laying females of this species were the most noticeable insect over the water at dusk on this small trout stream in Wisconsin's Blue Hills. I caught several of them along with one male netted in mid-air mated to one of the females.

Lateral view of a Female Siphlonurus (Siphlonuridae) (Gray Drake) Mayfly Spinner from Devil's Creek in Wisconsin
Female Siphlonurus (Siphlonuridae) (Gray Drake) Mayfly Spinner from Devil's Creek in Wisconsin
Dorsal view of a Female Siphlonurus (Siphlonuridae) (Gray Drake) Mayfly Spinner from Devil's Creek in Wisconsin
Ruler view of a Female Siphlonurus (Siphlonuridae) (Gray Drake) Mayfly Spinner from Devil's Creek in Wisconsin The smallest ruler marks are 1 mm.
Ventral view of a Female Siphlonurus (Siphlonuridae) (Gray Drake) Mayfly Spinner from Devil's Creek in Wisconsin

This mayfly was collected from Devil's Creek in Wisconsin on June 14th, 2021 and added to Troutnut.com by Troutnut on June 21st, 2021.


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Female Siphlonurus (Gray Drake) Mayfly Spinner Pictures

Collection details
Location: Devil's Creek, Wisconsin
Date: June 14th, 2021
Added to site: June 21st, 2021
Author: Troutnut
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