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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 Zapada (Tiny Winter Blacks)

Where & when

In 118 records from GBIF, adults of this genus have mostly been collected during April (32%), March (19%), May (11%), February (10%), June (10%), July (8%), and January (5%).

In 80 records from GBIF, this genus has been collected at elevations ranging from 34 to 11135 ft, with an average (median) of 6755 ft.

Genus Range

Specimens of the Stonefly Genus Zapada

2 Female Adults
1 Adult
1 Nymph

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Stonefly Genus Zapada (Tiny Winter Blacks)

7 species (Zapada chila, Zapada cordillera, Zapada frigida, Zapada glacier, Zapada haysi, Zapada katahdin, and Zapada oregonensis) aren't included.
Genus Range
Common Name
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