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.

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Mayflies which crawl underwater to lay their eggs

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Jul 22, 2006July 22nd, 2006, 6:13 am EDT

It's fairly common knowledge that many Baetis mayflies crawl underwater to lay their eggs. What's strange is that most authors don't seem very surprised by this. As best I can tell from all my recent reading and note-taking, Baetis is the only genus of mayflies which displays this behavior. That seems remarkable.

Does anybody know of any other mayflies that do this? Have I missed something?

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Taxon