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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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington

This species was fairly abundant in a February sample of the upper Yakima.

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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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Pteronarcys californica (Giant Salmonfly) Stonefly Nymph Pictures

Here are two size classes of Pteronarcys nymphs. These probably represent two different generations. The largest will probably emerge next spring and the other in two years. There is probably another generation, smaller, I did not collect. In a Canadian study they discovered Pteronarcys eggs do not all hatch simultaneously but hatch for a period of nearly two years, making their egg/nymphal life 5 years. The other photo is of a curled nymph, a typical response to disturbance.

This stonefly was collected from the Touchet River in Washington on August 10th, 2011 and added to Troutnut.com by Bnewell on August 10th, 2011.

Discussions of this Nymph

Friday on the South Fork of the Boise

Posted by Bjorntofish on Jul 2, 2012

Last reply on Jul 2, 2012 by Bjorntofish

Friday, the PC stoneflies were hatching and flying midway up the river in the quality stretch of the South Fork of the Boise Rive (Idaho.) The fish seemed to be gorged with nymphs and only wanted the big nymphs fished in the current. We used large black Brooks flies with rubber hackle. They ignored most of the adult flies that fell to the surface. But the big bombers were lumbering over the water all day. Pretty exciting environment for fishing. At one point, I had two crawling on my neck while I was trying to work my drift into a large fish's feeding lane. Life is good.

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