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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Hydropsyche (Spotted Sedge) Caddisfly Larva Hydropsyche (Spotted Sedge) Caddisfly Larva

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington

With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.

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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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Family

This topic is about the Beetle Family Hydrophilidae

These are a common sight on most trout streams, especially in the calm backwaters. They aren't regarded as significant to trout, although I have found them in occasional stomach samples.

Example specimen

2
Hydrophilidae (Giant Water Scavenger Beetle) Beetle Adult

Dorsal view of a Hydrophilidae (Giant Water Scavenger Beetle) Beetle Adult from the Namekagon River in Wisconsin

This is a water beetle. It is the hardest object in the world to pick up with tweezers. The second hardest is Mount Everest.

DMM
Posts: 34

DMM on Nov 26, 2006November 26th, 2006, 5:00 pm EST

I noticed the ending of the family is reversed--should be -ae.

David

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Nov 29, 2006November 29th, 2006, 5:35 am EST

Thanks, fixed. I would encourage anyone else who notices incorrect spellings to speak up, too. I typed all 5000+ taxa into the database manually so there are sure to be plenty of other spelling errors. They're very easy for me to fix when you find them.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Hex MayfliesHexagenia limbata

Troutnut Forum › Fly Hatch Talk › Family