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.

A small spring creek in Wisconsin. A little brook trout stream tumbles over boulders

Stream photos

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Isoperla (Stripetails and Yellow Stones) Stonefly Adult Isoperla (Stripetails and Yellow Stones) Stonefly Adult

Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Adult from Mystery Creek #308 in Washington

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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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Site updates from May 5, 2007

Closeup insects by Bnewell from the Upper Stillwater River in Montana

Acerpenna pygmaea (Tiny Blue-Winged Olive) Mayfly Nymph

3 Pictures

Acerpenna pygmaea (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Upper Stillwater River in Montana

This is a very rare mayfly in western Montana. The shape of the last gill is a key to its identification. I have collected this species in only one location.

Collected May 4, 2007 from the Upper Stillwater River in Montana

Added by Bnewell on June 26, 2011

Collected May 4, 2007 from the Upper Stillwater River in Montana and added by Bnewell on June 26, 2011