I took fish from here to Saphael once. Since the fish were so fresh and delectable, a lot of people wanted me to bring them more. I've gotten so busy!
In particular, there are certain rare fish that live only on Sprite Island. One merchant discovered that the special nutrients contained in certain fish give people loads of energy. Demand went way up, so I need a whole bunch of 'em!
Would you like to help me?
Fishing is one of the ways you can train yourself. However, you can't improve yourself merely by fishing!
Obviously, you need to compete against an opponent of equal caliber if you want your training to mean something!