When Pi, an ordinary fish from Boston, arrives at the exotic reef to live with his Aunt Pearl, he is immediately attracted to Cordelia, the fish of his dreams.

There's just one big problem in the form of Troy, the meanest shark in the ocean, who not only patrols the reef keeping its community in fear of becoming his next meal, but also has his eye on Cordelia and wants her for himself.

Pi must join up with his new group of friends if he stands any chance of outwitting Troy and his henchmen, save the reef and win Cordelia!