When the freshly shed nymphal skins of large stoneflies cover a log like this, imitating the nymphs is a good bet for large trout. From the Namekagon River in Wisconsin.
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When the freshly shed nymphal skins of large stoneflies cover a log like this, imitating the nymphs is a good bet for large trout.

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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.