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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 5 pictures to aid in identification. The message is below.
Intermediate nymph. About 15 mm (excluding cerci).
Intermediate nymph. About 15 mm (excluding cerci).
Ventral view of nymph shown in photo above.
Mature nymph. About 16 mm (excluding cerci).
Mature nymph. About 16 mm (excluding cerci).
Healdsburg, CA

Posts: 344
Millcreek on Apr 1, 2015April 1st, 2015, 8:53 pm EDT
These nymphs are fairly common in the Russian River. Usually found in slightly warmer, quiet water areas near shore. Substrate usually consists of small gravel and algae-ridden stones.

The nymphs were keyed out with Merritt, Cummins and Berg (2008).
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