Some large Ephemerella mayfly nymphs cling to a log.  In the background, hundreds of Simuliidae black fly larvae swing in large clusters in the current.  In this picture: Mayfly Species Ephemerella subvaria (Hendrickson), Mayfly Species Ephemerella invaria (Sulphur Dun), and True Fly Family Simuliidae (Black Flies). From the Namekagon River in Wisconsin.
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Some large Ephemerella mayfly nymphs cling to a log. In the background, hundreds of Simuliidae black fly larvae swing in large clusters in the current.
In this picture: Mayfly Species Ephemerella subvaria (Hendrickson), Mayfly Species Ephemerella invaria (Sulphur Dun), and True Fly Family Simuliidae (Black Flies).

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Troutnut.com is a collection of pictures and information about fly fishing. Fly fishermen, fly tiers, and trout enthusiasts of all stripes can learn more about life beneath the surface of trout streams, as well as how to better imitate aquatic insects with artificial flies to catch trout. There are aquatic insect pictures, underwater pictures, landscape pictures, and a comprehensive reference to the common names of trout stream insects.