A: There is no such rod. The rod size depends upon the kind of fishing you will do. If you are striper fishing in the northeastern United States or fishing waters for heftier species like dolphin, then large, air-resistant flies are often the best offering. For such fishing you'll need a 10-weight. If you plan to fish for wary redfish, bonefish or seatrout, a 10-weight line crashing to the surface will spook most of them.