I like sylph's idea. Only improvement i would make is make it neccesary to require a Boat item to fish. They could come in different sizes - (S), (M), (L), (XL), (CruiseLiner) - and the type of fish you can catch will be affected by the size of the Boat you're using, the Luck on the OrcaRod and the quality/purity of the SylphBait being used. There should be a chance of failure too, at which point a message such as 'You're gonna need a bigger boat' could pop up.
This is a very good follow on from my initial idea, I like that boats would be required, perhaps it should work on the premise of; you choose a boat too small and the fish gets away, but choose a boat too large and you'll gain no benefit from catching the fish anyway.
