http://fillets.sourceforge.netFish Fillets - Next Generation is opensource version of original czech "Fish Fillets" game.
Now the game can be run on Windows, Linux, Mac and some consoles.
You can see compartation of the games
hereYou can download the original game also (for Windows)
hereFish Fillets NG is strictly a puzzle game. The goal in every of the seventy levels is always the same: find a safe way out. The fish utter witty remarks about their surroundings, the various inhabitants of their underwater realm quarrel among themselves or comment on the efforts of your fish. The whole game is accompanied by quiet, comforting music.