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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.

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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Millcreek has attached these 7 pictures. The message is below.
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on May 9, 2015May 9th, 2015, 7:05 am EDT
These were determined to genus using Merritt, Cummins and Berg (2008) as well as Wiggin's "Larvae of the North American Caddisfly Genera" (1996). They were identified to species using Don Burdick's illustrations of Trichoptera. Mature male pupae were used to make the species determination.

The mature larvae were 3 - 3.5 long with the cases measuring about 4 mm in length. The pupal cases were about 4 - 4.5 mm long. The larvae were found on Cladophora algae in a fairly fast flow. The pupal cases were in aggregations on the rocks.
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PaulRoberts
PaulRoberts's profile picture
Colorado

Posts: 1776
PaulRoberts on May 10, 2015May 10th, 2015, 3:10 pm EDT
Neat. Nice images. Thanks for these.

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