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.

Here Oksrukuyik Creek flows away from the Dalton Highway toward the pipeline. It eventually grows into one of the major rivers of the North Slope, and the main drainage to the west of the Sag, but where it crosses the road it's just a small grayling stream.

From Oksrukuyik Creek in Alaska

Stream photos

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Holocentropus Caddisfly Larva Holocentropus Caddisfly Larva

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington

This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.

11 Recently Added Photos

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 Species Perlesta placida (Golden Stones)

Where & when

Time of year : June through mid-August

Swisher and Richards list this as a major midwestern stonefly in Selective Trout.

In 50 records from GBIF, adults of this species have mostly been collected during June (52%), May (20%), July (20%), and August (6%).

In 18 records from GBIF, this species has been collected at elevations ranging from 2707 to 11001 ft, with an average (median) of 4183 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Time of day : Shortly after dark

Discussions of Perlesta placida

Perlesta placida

14 replies

Posted by Mad4Trout on Jul 3, 2011

Last reply on Nov 27, 2011 by Mad4Trout

I don't know why "Stoneflies of the United States" has such a limited range for Perlesta placida, but we (Madmen Chapter of TU) have collected them on the Mad River, Logan Co., OH. They were reported by Gaufin (1956, Ohio J. Sci. 56 (6):321-324) in numerous counties. They have been recorded more recently by Ohio EPA.

Start a Discussion of Perlesta placida

References

Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.