Someone wrote on a thread about a week or so ago about concentration; about how he or she goes into a "zone" when fishing with their eyes looking for any change or movement of the fly line. Same with ice fishing. Any movement up or down on a spring bobber or flimsy tip, set the hook. Other than when casting, I'm always concentrating on the line closest to an underwater fly, i.e., using a nymph with little movement. Also, keeping your rod low and pointing toward your fly allows you to raise the rod instantly with the slightest perceptible movement and setting the hook. Those slight movements may not always result in a hookup. Nothing lost, everything gained. Cast back and start anew. Fishing still waters is good practice for streams. Read Rick. He offers great lessons almost every week in the warm water section of the site. JGW