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.

Stream photos

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Isoperla (Stripetails and Yellow Stones) Stonefly Adult Isoperla (Stripetails and Yellow Stones) Stonefly Adult

Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Adult from Mystery Creek #308 in Washington

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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

source

Map of specific collection sites

Hatching behavior

Time of day : Evening

Start a Discussion of Micrasema bactro

References

Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.