Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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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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

Blue-winged OlivesBaetis

Troutnut Forum › Fly Hatch Talk › Family