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.

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Re: UV spectrum and trout
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Stonefly Species Sweltsa fidelis (Sallfly)

Specimens of the Stonefly Species Sweltsa fidelis

1 Female Adult

Female Sweltsa fidelis (Sallfly) Stonefly Adult

5 Pictures

In Baumann's Stoneflies of the Rocky Mountains, this specimen keys to Sweltsa fidelis, but the number of species in that key is fairly small and it might not be accurate.

Collected June 30, 2019 from the Madison River in Montana

Added by Troutnut on July 17, 2019