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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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Female Isonychia (Slate Drake) Mayfly Spinner Pictures

Lateral view of a Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Artistic view of a Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Dorsal view of a Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Ventral view of a Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Ruler view of a Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin The smallest ruler marks are 1 mm.
Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin
Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin

This mayfly was collected from the Teal River in Wisconsin on June 14th, 2021 and added to Troutnut.com by Troutnut on June 21st, 2021.


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Female Isonychia (Slate Drake) Mayfly Spinner Pictures

Collection details
Location: Teal River, Wisconsin
Date: June 14th, 2021
Added to site: June 21st, 2021
Author: Troutnut
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