Have you ever played Feeding Frenzy?
EZ Hunt is a game similar to Feeding Frenzy but can be played on iPhone. Start off as a little fish and eat your way up. You can only eat fish smaller than you, and if a larger fish touches you, you will lose one of your lives. When your life is zero, the game is over. The slider at the top helps you monitor your progress.
Try EZ Hunt and begin your sea exploration.