How about we rarely snag on the bottom and if line is strong enough and or skill high enough we might be able to pull up some treasure chest with something in it. Obviously small items. Or perhaps have something caught in the seaweed ocassionally. Ok maybe be a bit out there but would like a reef that we could snorkle on. I know that ain't exactly fishing but perhaps we could add in crab cages, minnow nets to acquire our own bait, and I don't know the name of em exactly but when they throw ropes in and let them sit till oysters and such are on them. Oysters having pretty pearls occassionally of course!
The above post about Expanding the fish descriptions idea was great too, and probably alot easier.