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.

This view of the pipeline, the Atigun River, and an impressive sunset/rise was one of my first views of the North Slope as I came through Atigun Pass in the middle of the night.

From the Atigun River in Alaska

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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Stone fly from Spain

Isidro
Posts: 24

Isidro on May 4, 2008May 4th, 2008, 3:04 am EDT

Maybe stone flies will be more successful than the mayflies. I tried to find a key for European families of Plecoptera but I don't have found it. This one was photographed yesterday at Bádenas, Teruel, Aragon, NE Spain at 850 meters high, in a point of permanent quiet water very dirty and full of aquatic grasses and hedges (Typha, Scirpus etc), with lime soil and surrounded by cultivated fields. The stone fly sizes about 17 mm long (including wings, not including antennae), and have not cerci. I have the collected expemplar for see the venation or all these characters that you can need for helps me with the identification.

Here are a list of all Iberian Peninsula stoneflies.

http://www.fauna-iberica.mncn.csic.es/faunaib/arthropoda/insecta/plecoptera/index.php

And here is the bug.

Thanks in advance.
Isidro

Isidro
Posts: 24

Isidro on May 8, 2008May 8th, 2008, 11:52 am EDT

What a great success!!!

Well, looking in a book I see the venation very, very similar to Nemoura. I thinks that family Nemouridae is sure, then. But there are many, many (too many) species... so, it's impossible, only would be identified by distribution maybe...