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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.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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 Genus Ceraclea (Scaly-Wing Sedges)

Ceraclea caddisflies are not ranked among the superhatches, but they may cause selective feeding at times. Ceraclea transversa is the most important species.

Where & when

Time of year : Early summer for most species

Preferred waters: Rivers or lakes

In 649 records from GBIF, adults of this genus have mostly been collected during June (31%), July (31%), August (18%), and May (14%).

In 253 records from GBIF, this genus has been collected at elevations ranging from -30 to 7546 ft, with an average (median) of 942 ft.

Genus Range

Hatching behavior

Time of day : Late afternoon and evening

Gary LaFontaine notes in Caddisflies that Ceraclea species become active a little earlier in the evening than most other caddisflies in the same days, sometimes prompting trout to take them selectively before the other flies have even appeared.

Egg-Laying behavior

Time of day: Late afternoon and evening

Larva & pupa biology

Environmental tolerance: Requires cool water

Ceraclea larvae are not important as a trout food, but their biology is interesting. Some species feed on and burrow into freshwater sponges.

Start a Discussion of Ceraclea


Caddisfly Genus Ceraclea (Scaly-Wing Sedges)

33 species (Ceraclea alabamae, Ceraclea alagmus, Ceraclea albostictus, Ceraclea alces, Ceraclea ancylus, Ceraclea annulicornis, Ceraclea arielles, Ceraclea brevis, Ceraclea cama, Ceraclea cancellatus, Ceraclea cophus, Ceraclea daggyi, Ceraclea dilutus, Ceraclea erraticus, Ceraclea erullus, Ceraclea excisus, Ceraclea flavus, Ceraclea floridanus, Ceraclea latahensis, Ceraclea maccalmonti, Ceraclea mentieus, Ceraclea neffi, Ceraclea nephus, Ceraclea nigronervosa, Ceraclea ophioderus, Ceraclea protonepha, Ceraclea punctata, Ceraclea ruthae, Ceraclea slossonae, Ceraclea spongillovorax, Ceraclea submacula, Ceraclea uvalo, and Ceraclea vertreesi) aren't included.
Genus Range
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