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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Zapada cinctipes (Tiny Winter Black) Stonefly Nymph Zapada cinctipes (Tiny Winter Black) Stonefly Nymph

Dorsal view of a Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington

Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.

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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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From yesterday on the Bitterroot river

Leskorcala has attached these 4 pictures to aid in identification. The message is below.

Leskorcala
Posts: 16

Leskorcala on Feb 25, 2020February 25th, 2020, 2:16 am EST

I belie this is small BWO family Baetidae nymph , very small in looks like immature stage since the wing pads are still lighter color. came out of slow water from Bitterroot River in Montana

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Mar 6, 2020March 6th, 2020, 4:22 am EST

You might try putting your nymphs in water or alcohol and submerging them, then taking photos. This will allow gills, tails and antennae to float free and be seen better.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Swpabrown
PA

Posts: 4

Swpabrown on Mar 6, 2020March 6th, 2020, 9:10 am EST

brown trout snack