FishVille is a real-time aquarium simulation game developed by Zynga, available as an application on the social-networking website Facebook. The game allows members of Facebook to manage a virtual aquariums by rearing fish. As of October 2011, FishVille had 1.6 million monthly active users.When users begin the game, they can start by choosing a background and gravel for their aquariums. The users start with four fish already present in their tank. A tutorial then commences which takes the user through some of the basic functions of the game which include adding fish to the aquarium, feeding and selling fish. Upon selling fish, the user earns "sand coins" and experience points (XP).