For this game I opted to go for a keyboard control based approach. Fish swim under your boat and you can cast your line to catch em. The video I have here is a basic mechanics overview of the game before I go loopy with the graphics. Enjoy
Tools:
-Slick2D/LWJGL
-DanqueDynasty
(btw, someone wouldn't happen to have an 8 bit version of "drunken sailor" would they by chance??)