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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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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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Report at a Glance

General RegionWestern Colorado
Specific LocationFrying Pan River, Basalt, CO
Dates Fished7/28
Time of Day8 AM - 4 PM
Fish CaughtRainbows, Browns, Hybrids
Conditions & HatchesFlows are perfect at 226 but big runoffs have changed the dynamics of the river slightly.

PMD's are abundant, a lot of small white midges hatching in abundance. Hatches started around 10 AM and were constant through late afternoon.

Most active I've ever seen the fish on the Pan. Best results on top were with a size 18 pinkish Sparkle Dun. No action on adult duns.

Underneath they were very active on Princes, Miracle Midges, and Red Brassies. I used size 16 for the Prince, 20 on the midge, and 24-26 on the Brassies. Size 6 leader and tippet, size 7 for the dropper

Fish were rising to Green Drakes but I didn't see any flying above the 9 mile point. But apparently they've seen them this summer so don't be afraid to use a big Green Drake to drop your midges. Fish were also rising to the Sparkle Dun when there wasn't rapid rising so they were definitely paying attention to the surface.

Details and Discussion

WestCO
WestCO's profile picture
Palisade, CO

Posts: 65
WestCO on Jul 29, 2011July 29th, 2011, 10:55 am EDT
Really pay attention to the floor as a lot was shifted with extreme runoff. There is a lot of wood in the water and I was snagged quite often. The rocks can be a little bit loose so just wade carefully.
...but fishermen I have noticed, they don't care if I'm rich or poor, wearing robes or waders, all they care about is the fish, the river, and the game we play. For fishermen, the only virtues are patience, tolerance, and humility. I like this.

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