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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

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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Stonefly Genus Prostoia (Tiny Winter Blacks)

Where & when

In 86 records from GBIF, adults of this genus have been collected during April (35%), March (30%), May (20%), February (9%), and June (6%).

In 11 records from GBIF, this genus has been collected at elevations ranging from 20 to 10007 ft, with an average (median) of 499 ft.

Genus Range

Specimens of the Stonefly Genus Prostoia

1 Nymph

Start a Discussion of Prostoia

Stonefly Genus Prostoia (Tiny Winter Blacks)

Species in Prostoia: Prostoia completa
3 species (Prostoia besametsa, Prostoia hallasi, and Prostoia similis) aren't included.
Genus Range
Common Name
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