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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Female Sweltsa borealis (Boreal Sallfly) Stonefly Adult Female Sweltsa borealis (Boreal Sallfly) Stonefly Adult

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington

I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.

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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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Need help Identifying this please ?

Btbo32 has attached this picture to aid in identification. The message is below.

Btbo32
Posts: 13

Btbo32 on Nov 18, 2017November 18th, 2017, 11:06 am EST

Can anyone please help me identify this nymph? I noticed this as I was zooming in on the maccafertium nymph. Found in North Jersey (Big Flatbrook) last month. Thanks!

Jersey Boy

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on Nov 18, 2017November 18th, 2017, 5:18 pm EST

I'd suggest putting nymph on a white background and taking a larger photograph for identification. Our bug guys are good, but they may not be able to make out enough detail on the one posted here. A big white plastic cap from a cat litter jug would make a good background, or any lid with a white inside. Adding a little water might make the legs, tails, etc. stand out more.

"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

Taxon