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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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.

9 Recently Added Photos

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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Site updates from July 20, 2010

Closeup insects by Bnewell from the Vermillion River and Miscellaneous Montana in Montana

Caudatella edmundsi Mayfly Nymph

1 Picture

Caudatella edmundsi (Ephemerellidae) Mayfly Nymph from the Vermillion River in Montana

This species was previously know only from the nymph. I reared nymphs and we described the adults and eggs of this interesting species.

Collected July 19, 2010 from the Vermillion River in Montana

Added by Bnewell on June 26, 2011

Collected July 19, 2010 from the Vermillion River in Montana and added by Bnewell on June 26, 2011

Arachnida (Mites and Spiders) Arthropod Adult

2 Pictures

Water mites are common in lakes and ponds but because they are so small they do not get noticed.These specimens are from temporary wetlands in Glacier National Park.

Collected July 19, 2010 from Various wetlands in Montana

Added by Bnewell on June 26, 2011

Collected July 19, 2010 from Various wetlands in Montana and added by Bnewell on June 26, 2011