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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 Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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Updates from June 18, 2010

Updates from June 18, 2010

Closeup insects by Bnewell from the Kwethluk River in Alaska

Ephemerella aurivillii (Ephemerellidae) Mayfly Nymph from the Kwethluk River in Alaska
I have collected this species in Montana but it is very common in Alaska streams.

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