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.

Stream photos

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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

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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 Oxyethira serrata (Cream and Brown Microcaddisflies)

Where & when

Time of year : Early summer

Preferred waters: Rivers and lakes

This species can be very abundant in the North.

In 52 records from GBIF, adults of this species have mostly been collected during July (35%), June (27%), May (13%), August (13%), and September (10%).

In 20 records from GBIF, this species has been collected at elevations ranging from 269 to 5518 ft, with an average (median) of 899 ft.