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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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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Mayfly Species Epeorus grandis

Where & when

Time of year : June through early August

Preferred waters: Small streams

Altitude: Above 5,000 feet

In 9 records from GBIF, adults of this species have been collected during July (33%), May (22%), June (22%), August (11%), and April (11%).

In 7 records from GBIF, this species has been collected at elevations ranging from 131 to 8500 ft, with an average (median) of 3363 ft.

Species Range

Nymph biology

Current speed: Fast

Environmental tolerance: Requires very cold streams

Specimens of the Mayfly Species Epeorus grandis

3 Nymphs

Start a Discussion of Epeorus grandis

References

Mayfly Species Epeorus grandis

Species Range
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