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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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

Start a Discussion of Zapada


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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