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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 Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.
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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Baetis bicaudatus (BWO) Mayfly Nymph Pictures

Under the microscope, this one clearly has hind wingpads.

Ventral view of a Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Chatter Creek in Washington
Dorsal view of a Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Chatter Creek in Washington
Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Chatter Creek in Washington
Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Chatter Creek in Washington
Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Chatter Creek in Washington
Ruler view of a Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Chatter Creek in Washington The smallest ruler marks are 1 mm.
Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from Chatter Creek in Washington

This mayfly was collected from Chatter Creek in Washington on June 3rd, 2022 and added to Troutnut.com by Troutnut on June 4th, 2022.


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Baetis bicaudatus (BWO) Mayfly Nymph Pictures

Collection details
Location: Chatter Creek, Washington
Date: June 3rd, 2022
Added to site: June 4th, 2022
Author: Troutnut
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