Ok, so lately I've been playing with this fishing script of mine. I'm using a gargoyle with 70 throwing to kill those nasty sea serpents, tough this script doesn't have healing sub in it- as it's not required, hp regen solves this problem easily. It carves the serpents body, takes hides, regs, gold and keeps fishing until max weight +50 has been reached, then recalls back home, drops the loot and recalls back to the ship. I've been using Gargish Galleon as a ship with out cannons, so I don't know if this script works on any other ship.
Try it out, and leave your oppinion.