The Quadfish is more of a modernized performance style fish, compared to the Traditional Fish. It's a little more responsive, and easier to control. This is what a fish ends up looking like when you add new modern ideas and theories to an old school design.

I have pulled in the nose and the tail to add some curve in the outside shape of the board for a little more response and control to pull off maneuvers easier. The 4 fins instead of two seems to increase the performance of the board without losing it's speed. And I also added two slight bumps in the outside lines of the tail, which allows for a more responsive turn without losing too much speed from making the base of the tail narrower.