Let’s imagine a trout holding in two feet of water with a medium current — a speed that matches a comfortable and casual walking pace. The trout lies on the bottom, with its nose in the flow, watching for available food drifting downstream toward it. Perhaps the trout is keying on Sulfur mayfly duns, and it’s rising confidently to most of the half-inch, yellowish insects that drift into view of its seam.
Here comes the next dun . . .