just that! isn't it weird it exists only one kind of fish in the world?! where did it came from? it's not I don't like salmon but there're islands, continents, but when on shore I fail to see the sea. oh the sea! and where are the rivers? why can't I just take my fishingpole and fishbait and go fish?
it could be a mini game for one or more players. it could be in the sytle of the adventure game Breath of Fire 2 or 3 fishing (do you know it? google for it and think how fun it could be). it could be that the fishes could be used as more recipes, healing purposes or "potion effects". it can be wonderful