You would need a heavy rod obtained from otto south of the barbarian outpost. I'd advise you take a knife as well along with about 100 fishing bait. When you have a full inventory of fish you cut them and use the product for bait. Caviar makes about 500gp ea, but would require banking. Caviar and Roe can both be used for bait so you would not have to leave from the spot if you were just looking for the experience