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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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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