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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.

Dorsal view of a Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.
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.

Hollidaysburg Pa

Posts: 251
LittleJ on May 16, 2010May 16th, 2010, 11:18 am EDT
So while flipping rocks today I had an interesting find. There were caddis pupa tethered to the bottom of the rock in what looked like a clear tube. To the people that know about these types of things. Would this be the pupal case they make after leaving their rock case, right before they emerge? Or could their case have broken apart and this would be what they would look like inside their case. Either way it was cool to get a look at a caddis pupa unharmed prior to emergance.

Grants Pass, OR

Posts: 302
Creno on May 16, 2010May 16th, 2010, 3:08 pm EDT
Was the "case" tan colored, and sorta inflated like a balloon? If so, sounds like a Rhyacophila pupa. Search on Rhyacophila above for a picture. The "case" is a cocoon that the larva makes within the actual pupal case. A couple families (rhyacophilds, glossosomatids hydrobiosids) make these internal cocoons within the case. The fact that you found just the case suggests a rhyacophild since they make very loose collections of stones for their pupal case. Often the case is connected to a couple rocks so when you pick up a rock the case separates stays with one rock and the pupal cocoon is still attached to another. If your critter didn't have the tan cocoon let us know and I will make another guess :-)
Hollidaysburg Pa

Posts: 251
LittleJ on May 16, 2010May 16th, 2010, 3:17 pm EDT
Thanks creno! I don't believe that the case was Tan. It really just looked like a clear plastic tube. However the Ryachophila sounds good enough for me.

Grants Pass, OR

Posts: 302
Creno on May 16, 2010May 16th, 2010, 3:43 pm EDT
If it was a tube, with a hole at either, or both ends, it probably wasn't a rhyacophilid. Rhyacophila cocoon are pretty distinctive and Jason's picture is very good.

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