That's interesting Scott...I have caught large RES on mini BG cranks too, and jig/crawler on bottom works well for me, but that's about it in my experience. I think nymphing with the flyrod would be a challenge - but may also be productive once one learned how they preferred the presentation and found a good pattern. I will pay a ransom for anyone who can get a photo of a RES taken on the flyrod - cocktail of the angler's choice at PB VI.

Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau

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