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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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington

This species was fairly abundant in a February sample of the upper Yakima.

10 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.

Trout Stream Insects, Page 3

Visit the Trout Stream Insects section for thousands of closeups of mayflies, stoneflies, caddisflies, and others, along with detailed information about their life cycles and relevance to angling. This section showcases a few favorites.

Lateral view of a Male Ephemerella tibialis (Ephemerellidae) (Little Western Dark Hendrickson) Mayfly Dun from Rock Creek in Montana

Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana

Case view of a Hesperophylax (Limnephilidae) (Silver Striped Sedge) Caddisfly Larva from the South Fork Snoqualmie River in Washington

Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Nymph from the South Fork Snoqualmie River in Washington

Artistic view of a Male Epeorus deceptivus (Heptageniidae) Mayfly Dun from the South Fork Sauk River in Washington

Artistic view of a Male Drunella doddsii (Ephemerellidae) (Western Green Drake) Mayfly Dun from the Gulkana River in Alaska

Artistic view of a Male Ephemerella aurivillii (Ephemerellidae) Mayfly Spinner from Nome Creek in Alaska

Male Ephemerella aurivillii (Ephemerellidae) Mayfly Dun from Nome Creek in Alaska

Artistic view of a Female Ephemera guttulata (Ephemeridae) (Green Drake) Mayfly Dun from the West Branch of the Delaware River in New York

Lateral view of a Male Nigronia serricornis (Corydalidae) (Fishfly) Hellgrammite Adult from Brodhead Creek in Pennsylvania

Large hellgrammite (dobsonfly larva). This nearly two inch long larva from the genus Corydalus is a fearsome predator

Dorsal view of a Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania

Artistic view of a Corydalus (Corydalidae) (Dobsonfly) Hellgrammite Larva from Paradise Creek in Pennsylvania

Lateral view of a Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from Penn's Creek in Pennsylvania

Lateral view of a Female Baetisca obesa (Baetiscidae) (Armored Mayfly) Mayfly Dun from the Neversink River (aquarium-raised) in New York

Artistic view of a Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York

Siphlonurus mayfly nymph. These mayflies are known as strong swimmers that maneuver like minnows across the stream bottom

Artistic view of a Siphlonurus quebecensis (Siphlonuridae) (Gray Drake) Mayfly Nymph from the Delaware River in New York

A hairy mayfly nymph. This gangly, odd-looking nymph is from the rare species Ephemerella septentrionalis

Artistic view of a Male Penelomax septentrionalis (Ephemerellidae) Mayfly Nymph from the Delaware River in New York

This is one of my favorite stonefly pictures. I was playing around with holding my flash heads in different locations, and I got a neat lighting effect by holding one straight above the nymph's tank.

Artistic view of a Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Mongaup Creek in New York

Hex MayfliesHexagenia limbata

Trout Stream Insects, Page 3

Trout Stream Insects, Page 3

Hex Mayflies
Hexagenia limbata