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.

Stream photos

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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

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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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More from Derwent, UK

Sglidster has attached these 3 pictures to aid in identification. The message is below.

Sglidster
Posts: 3

Sglidster on Feb 23, 2012February 23rd, 2012, 8:41 am EST

Thanks for the ID on the last pic.

I'm pretty sure these are:

1. Ecdyonurus torrentis - large brook dun

2. Plecoptera perlodidae - yellow sally

3. Baetis muticus - Iron blue

4. Hydropsyche

Am I OK with these?

Thanks,

Simon

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Feb 23, 2012February 23rd, 2012, 5:00 pm EST

I don't know my UK species, and some (like Hydropsyche) might be hard to tell apart from close relatives in those pictures, but within those limitations your IDs look good to me. Hopefully somebody who betters knows the UK can chime in.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Hex MayfliesHexagenia limbata

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