When you havee gone to the fishing competition in Fisher's Creek, the best fish too look for are in the northern wastes, preferably Necropolis. Within necropolis, I have found a 7000 g (70 kilo) moonfish - a very good prize! The more you fish, the better it becomes - you can make a living off it, if you are in the early parts of the game! Actually, I might go back, start again and do that - make a living on fishing alone! Cool!