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.

Here Oksrukuyik Creek flows away from the Dalton Highway toward the pipeline. It eventually grows into one of the major rivers of the North Slope, and the main drainage to the west of the Sag, but where it crosses the road it's just a small grayling stream.

From Oksrukuyik Creek in Alaska

Stream photos

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Skwala (Large Springfly) Stonefly Nymph Skwala (Large Springfly) Stonefly Nymph

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington

This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.

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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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Caddisfly Species Rhyacophila narvae (Green Sedges)

Where & when

Time of year : Early summer

Preferred waters: Small mountain streams

In 17 records from GBIF, adults of this species have been collected during June (29%), July (29%), August (12%), May (12%), April (12%), and March (6%).

In 2 records from GBIF, this species has been collected at elevations of 197 and 6726 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Morning

Egg-Laying behavior

Time of day: Morning

Start a Discussion of Rhyacophila narvae

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.