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.

The North Fork Couer d'Alene River in Idaho

Stream photos

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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

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.

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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 Isoperla signata (Yellow Sallies)

This is a common pale yellow species.

Where & when

Time of year : Summer

In 42 records from GBIF, adults of this species have mostly been collected during May (52%), June (29%), and April (7%).

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Nighttime

Egg-Laying behavior

Time of day: Dusk

Start a Discussion of Isoperla signata

References

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