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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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Caddisfly Species Micrasema bactro (Little Grannoms)

Where & when

Time of year : Late June

In 34 records from GBIF, adults of this species have mostly been collected during July (35%), August (32%), May (15%), and June (12%).

In 18 records from GBIF, this species has been collected at elevations ranging from 1650 to 8566 ft, with an average (median) of 4862 ft.

Species Range

Hatching behavior

Time of day : Evening

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Caddisfly Species Micrasema bactro (Little Grannoms)

Species Range
Common Name
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