Howdy,
When Silvers are in a frog-water a bead-eye fly (usually yellow,orange or red and combinations there-of) fished on a floating line and counted down, then slowly retrieved will elicit strikes.

Fish holding in runs with some current will chase down marabou's in the same colors when quickly stripped by them. Think how effective a spoon or spinner is on silvers, they are hardwired to chase something thats trying to evade them. Have some fun!