If you want to test the mechanics before buying the real game, PiviGames is the perfect demo. If you want the full oceanic nightmare, buy Feed and Grow Fish on Steam.
The game icon is usually a silhouette of a fish jumping out of water, or a cartoon shark. Avoid clicking on "Fish Eat Fish" or "Hungry Shark"—these are different games. feed and grow fish pivigames
The primary objective is to eat smaller creatures to gain experience (EXP) and grow in size while avoiding larger predators. If you want to test the mechanics before