That said, 14-weight fly rods are what we use, but in recent years a few rod manufactures have been making 16-weights. Keep in mind, however, that the heftier the fly outfit, the heavier the weight, and the harder it is to cast. And this is critical when you have to get the fly out there quickly. Truth be told, 16-weights are like casting with a broomstick. While 14-weights aren’t much better, you really need at least that to beat tuna weighing north of 70-pounds.