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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.

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.
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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Sweltsa (Sallfly) Stonefly Nymph Pictures

This was by far the most abundant stonefly in my sample on May 14th.

Ruler view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.
Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Ventral view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
False color image enhancing contrast on the setae on the tails. On the right tail (top), a few setae appear as double images due to an artifact of the focus stacking proces.

Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington
Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the South Fork Snoqualmie River in Washington

This stonefly was collected from the South Fork Snoqualmie River in Washington on May 14th, 2022 and added to Troutnut.com by Troutnut on May 16th, 2022.


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Sweltsa (Sallfly) Stonefly Nymph Pictures

Collection details
Location: South Fork Snoqualmie River, Washington
Date: May 14th, 2022
Added to site: May 16th, 2022
Author: Troutnut
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