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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 Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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 RegionAddingham, West Yorkshire
Dates FishedJuly 18, 2007
Time of DayPM
Fish CaughtFour gorgeous British browns
Conditions & HatchesClear Weather (hooray!)
deep fast clear water
temp- 57 or so
hatches- sporadic yellow mayflies and later some smaller bluish ones, but not fishable

Details and Discussion

CaseyP
CaseyP's profile picture
Arlington, VA/ Mercersburg, PA

Posts: 653
CaseyP on Jul 18, 2007July 18th, 2007, 10:46 am EDT
Bead head pheasant tail nymph with antron indicator really rocks--caught all the fish on one. everything else lost early on to rocks and moss. fished one big riffle across and back twice in the afternoon. river dropping nicely but it's still over knee deep. had the place to myself as well. the whole afternoon was out of a book...

thanks to Gonzo's tips, landed four, three took early release, and 3 more gave it a shot but avoided commitment.

(rats! photos didn't take. i'll try again at home.)
"You can observe a lot by watching." Yogi Berra

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