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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 RegionPennsylvania
Specific LocationCentral PA
Dates FishedApril 7, 2019
Time of Daymorning
Fish CaughtBrowns and a Bow
Conditions & HatchesGrannoms, Olives

Details and Discussion

Martinlf
Martinlf's profile picture
Moderator
Palmyra PA

Posts: 3047
Martinlf on Apr 8, 2019April 8th, 2019, 3:40 pm EDT
After dealing with picky olive eaters for about a month we finally have grannoms. It's great to have bigger bugs and fish eager to go after them. Caught some fish that I could not interest in olives a week or so ago. From here on, the hatches just get better. Tight lines all!
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Partsman
Partsman's profile picture
bancroft michigan

Posts: 321
Partsman on Apr 9, 2019April 9th, 2019, 12:37 am EDT
I went up to Grayling Sunday for a nymph fishing class at Gates lodge, there some bugs starting to come on the river as we worked on technique. I stopped at the Rifle rive on the way home and there was also some bug activity going on. Water temp was 42 degrees, but it finally has turned to spring around here! Im looking forward to better things.
Mike.
Summer_doug
Detroit, MI

Posts: 46
Summer_doug on Apr 9, 2019April 9th, 2019, 12:15 pm EDT
I don’t mean to thread jack, but how was the Rifle looking Mike? I’m thinking about heading up on the Thursday before Good Friday and fishing Friday morning.

After finally getting out on some water, I’m itching to get out again. I was extremely rusty to the point of embarrassment for the first 3 hours or so!

Bring on Spring!
From Michigan

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