Deep sea fishing requires specific equipment, like down-riggers and out-riggers, rod-holders, and potentially SEAT BELTS. It really does depend on what you're wanting to catch. I've always "mooched" in salt water, and well, crab, clams, and mussels all quake in fear if I'm around.
Having said that, I know for a fact that up near Campbell River, BC (great salmon fishing up that way), a fisherman landed a 65 lb chinook.... on a fly rod with 20 lb test. Now THAT would've been something to see !