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.

Stream photos

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Hydropsyche (Spotted Sedge) Caddisfly Larva Hydropsyche (Spotted Sedge) Caddisfly Larva

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington

With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.

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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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Stonefly Species Isogenoides olivaceus (Olive Springflies)

This is a common olive brown species according to Swisher and Richards in Selective Trout. The Stoneflies of the United States page leaves me somewhat skeptical of the identification, however.

Where & when

Time of year : May through June

Species Range

source

Egg-Laying behavior

Time of day: Midday

Start a Discussion of Isogenoides olivaceus

References

Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.