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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.

Mayfly Species Heptagenia pulla (Golden Dun)

This elegant species may produce fishable hatches.

Where & when

Time of year : June to October

There are conflicting accounts of the emergence dates for this species. The Leonards in Hatches II give June 2nd to August 4th as the dates for emergence in Michigan, while Caucci and Nastasi in Hatches II say it hatches from August through October. Knopp and Cormier say it hatches from mid-May through August. I don't know who is correct, but I have collected near-mature nymphs in June in northern Wisconsin.

Nymph biology

Current speed: Slow to medium; sometimes riffles

Substrate: Detritus

Specimens of the Mayfly Species Heptagenia pulla

3 Nymphs

Recent Discussions of Heptagenia pulla

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References

Species Range
Common Names
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