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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.

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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PaulRoberts has attached this picture to aid in identification. The message is below.
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PaulRoberts on Feb 1, 2018February 1st, 2018, 4:43 am EST
Hey folks! Hope all is well. I've been on warmwater ponds doing underwater video work. Haven't chased trout in a while. But I did video a small brown being narfed by a larger one! Never know what might happen down there.

Anyway, I have been working out shooting warmwater aquatic microinverts, and I came across these tiny caddis. They are likely fairly early instars as they are minute, and were caught beneath ice cover. They swim quite well with their long bristled oar-like legs. Any guesses?
Grants Pass, OR

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Creno on Feb 1, 2018February 1st, 2018, 3:58 pm EST
Paul - appears to be a leptercerid, several of which are good swimmers. How small is it? The tapered case is unusual for the swimming genera so maybe it will change it case shape in the later instars. Creno
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PaulRoberts on Feb 2, 2018February 2nd, 2018, 1:28 am EST
Hi Dave, That would make sense. They are tiny -the smallest I'm guessing 1-2mm, the one pictured maybe 3mm. Ah!...The one in the picture got wedged between the glass sheets that made the tiny aquarium I was using. That gap is 2mm -so 2mm is the height on the anterior end of the case. So, yeah, I think 3mm to 4mm for the length of the larger larva.

They are, apparently, pretty common in the Elodea and coontail here.

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