RULES AND FEATURES
We have such a game, Underwater World (link below) is called. This video captures the passage of the first few levels of the game. See how bigger fish eat smaller ones, and how hard it is to be a fry when there are predators swimming around you, ready to eat you at any moment.
You can view the video clip SURVIVE IN THE UNDERWATER WORLD online 24 hours a day for free. It is no need to download and install it on your computer, and it is also not required you to be the registered user. Just ckick and enjoy. See also a set of related games below on that you might be interested to look.