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Yamamoto's FA Nymph
I can't emphasize the importance of nymph emergence during mayfly hatches and how intensely trout key on the stage. All of my literature review and observations at Livingston's spring creek support this theory. We are not talking about "misc nymph fly patterns fished under bobber". Rather, mayfly nymph as creature. Indeed fishing for this stage is as technical as dry-fly fishing for duns.
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