A free program for Android, by Great Hyper Games.
Fish Town IO: Mini Aquarium is a free multiplayer online battle game where you can fight and battle with other fish in the ocean to become the king. In this game, you can fight with a sword or a fishing hook to kill other fish.
The gameplay is very simple. You will play in an arena where you can see other players and fight with them. There are also different weapons and skills that you can use to attack them. The most important thing is that you need to grow as big as possible to dominate the arena.
If you want to become the king of the ocean, then you should try to feed on as many other fish as you can.