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.

I spent more than an hour casting to several rising trout in this pool and caught only two. Its clear water and tricky currents harbor dozens of free-rising, usually very hard-to-catch fish.

From Enfield Creek in New York

Stream photos

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Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington

This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.

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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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Hennys below Mio

Gtheory

Indianapolis - Grayling

Posts: 1

Gtheory on Dec 25, 2017December 25th, 2017, 2:45 am EST

Fished the late / light Hendricksons below Mio (Au Sable) last year and was left with the impression that the daily schedule is a little different there. What I mean specifically is that we arrived at the river around 11am to an already in progress spinner fall getting started, then wind slowed things down and we had great hatchers most of the rest of the day hoping for spinners to re-appear. All this commenced on an a-typical schedule. Typically up in the Holy Waters and the South one expects to find hatchers at the peak water temp which is about 2-4 pm that time of year.

I suppose the all early / all day hatching can be explained by the warmer temps spilling over from Mio Pond.

I'd love to hear the low down on what the expected daily hatch schedule is down there (for Hennys). It seems a little a-typical but this is based on three data points.

- your's "Gear and Theory"