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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
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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Male Siphlonurus occidentalis (Gray Drake) Mayfly Spinner Pictures

This specimen was easy to key to species using the old keys in < id="115" />, and was the basis for IDs of several other Siphlonurus specimens of the same species collected on the same day.

Male Siphlonurus occidentalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Lateral view of a Male Siphlonurus occidentalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Male Siphlonurus occidentalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Male Siphlonurus occidentalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Ruler view of a Male Siphlonurus occidentalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho The smallest ruler marks are 1 mm.
Ventral view of a Male Siphlonurus occidentalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho

This mayfly was collected from the Henry's Fork of the Snake River in Idaho on July 31st, 2020 and added to Troutnut.com by Troutnut on August 16th, 2020.


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Male Siphlonurus occidentalis (Gray Drake) Mayfly Spinner Pictures

Collection details
Location: Henry's Fork of the Snake River, Idaho
Date: July 31st, 2020
Added to site: August 16th, 2020
Author: Troutnut
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