You start with a small selection of fish, some money and a tank. You must breed them, care for them, help them grow, and cure them if they get sick. Along the way you can buy supplies, medicine, research technologies or invest in advertisement to enable you to discover rarer and rarer species until you find the Magic Fish. All of this will be financed by selling exotic hybrids in your shop.
The game runs in TRUE REAL-TIME, so that if your device is turned off or you exit the game, hours later small fish will have grown larger and new surprises await you.