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 beautiful braided reach of the Sag River, with the Philip Smith Mountains in the Arctic National Wildlife Refuge (ANWR) in the background.

From the Sagavanirktok River in Alaska

Stream photos

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Female Skwala (Large Springfly) Stonefly Adult Female Skwala (Large Springfly) Stonefly Adult

Lateral view of a Female Skwala (Perlodidae) (Large Springfly) 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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Stonefly Genus Leuctra (Needleflies)

Ernest Schwiebert notes in Matching the Hatch that trout are very fond of these uncommon stoneflies when they are available.

Where & when

In 26 records from GBIF, adults of this genus have been collected during June (42%), August (27%), May (19%), and July (12%).

In 8 records from GBIF, this genus has been collected at elevations ranging from 52 to 4203 ft, with an average (median) of 1394 ft.

Genus Range

source

Map of specific collection sites

Start a Discussion of Leuctra

References

Schwiebert, Ernest G. 1955. Matching the Hatch. MacMillan Publishing Company.