As far as silvers in the river are concerned, my limited experience with catching them on a fly has shown that they like chase stuff. So casting to a holding area, letting my fly sink, and then stripping it back in is what has worked. (Remember, my experience is limited in this area.) As far as the fly is concerned, I have had luck using weighted bunny leeches. Good luck!
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"During every one of those thousands or more casts, the angler must cling to a silent prayer that is forever a winter’s hope, no matter what the actual fly pattern.”

Bill McMillan