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Mayfly Species Heptagenia pulla (Golden Dun)

This elegant species may produce fishable hatches.  

Where & When

Regions: East, Midwest

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 (Detritus: Small, loose pieces of decaying organic matter underwater.)

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