Mahogany dun mayflies emerge near Peterborough

October 5, 2026

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(Isonychia bicolor) was recorded on September 24 near Peterborough, NH.¹ This mayfly species requires clean, well-oxygenated water and appears during fall emergence, a key shoulder season when other hatches are sparse.¹ The presence of this pollution-sensitive mayfly indicates suitable habitat conditions for clean-water aquatic insect communities.¹

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Mahogany dun and giant mayflies emerge in Athens County streams

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