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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.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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 Baetis bicaudatus (BWO) Mayfly Nymph Pictures

This specimen was collected along with a female which was quite a bit larger, different in color, but otherwise seemed the same morphologically.

Lateral view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Dorsal view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Ventral view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Ventral view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington
Ruler view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington The smallest ruler marks are 1 mm.
The darkened hind wing pad is clearly visible in this one.

Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Holder Creek in Washington

This mayfly was collected from Holder Creek in Washington on April 12th, 2021 and added to Troutnut.com by Troutnut on April 13th, 2021.


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Male Baetis bicaudatus (BWO) Mayfly Nymph Pictures

Collection details
Location: Holder Creek, Washington
Date: April 12th, 2021
Added to site: April 13th, 2021
Author: Troutnut
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