Fly Fishing Shock Tactics Your choice of fly on any given day could have been selected for any number of reasons.I have frequently met people fly fishing, who have selected the fly they are using based on their favourite colours or because they managed to catch a trout with it last time they used it, (which could have been months ago), or because the fishery owner/bailiff has recommended it as the best fly to use on this...... Similar Editorial : Negotiating Tactics by Richard Cunningham. | Source : Charter Fishing Boats