How would you approach this situation?

[ditchbanker]

I've tried floating a nymph under, but haven't done more than a foot or two. I'm pretty sure that's a recipe for lost flies here.

I think that after I get a fly rod I can at least dab out that far and hope to get him when he moves briefly into the open. On days where he's feeding on the surface it makes since he'd spend an increasing amount of his time in those openings.

This isn't a life or death question, just more of a curiosity how someone else would deal with it. I dealt with it by looking around, realizing I would almost certainly fail with a bubble, admiring the fact that the fish was smart enough to thwart me and moving on.
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