I had thought about rigging up a phantom drone for just such a thing. Live video and a bait release. and 1$ a run. My issues were 1: the wind gusts 2: googans casting in the general area could hit it with a sabiki 3: angry seabirds attacking it 4: being sky'd on by a king wanting the cargo 5: battery life to actually get more than a few good drops would be marginal 6: say the bite turns on and my drone is 200 yards out, i'm stuck flying, while fisherman are catching.
It would be cool for an experiment. I think you should give it a shot. if you could locate some of the reefs you could drop near them and probably catch some nice fish.