Fly casting makes it possible to deliver a relatively weightless lure or imitation of a living creature on target using line weight to develop momentum. That's a fairly dry way of saying that using a fly rod, you can catch fish with an artificial lure that can't be presented by any other method. It means that you can successfully fool a trout that feeds upon tiny insects measuring less than an eighth of an inch long or lure a 150 pound tarpon into striking a six inch feathered lure. Artificial flies are used to catch sunfish bass trout pike bluefish shark bonefish sailfish salmon walleye and even catfish. The possibilities are endless. Any fish that eats insects minnows or crustaceans can he caught with an artificial fly when they ascend freshwater rivers on their spa winning run from the sea. Fly fishing is most commonly associated with trout and salmon in stream in fact in most Atlantic salmon rivers in North America fly fishing gear is the only kind allowed by law. But the same tackle used for trout can provide endless hours of fascination in a Midwestern farm pond fishing for bluegills.