Fish tycoon is a game that runs in real time, even when when you are not playing or when your computer is off like a real aquarium. This means that babies will grow into bigger fish as time goes by. You can move between tanks. Simply click on the button for the thank you want to switch to. Drag a fish into the isolation tank to check out the name, age and health of the fish. To make a fish pregnant make sure you have a fish in the isolation tank and then drag another fish to it. In the fish supplies store you can buy all kind of supplies for your fish and for your tank. You need to sell your fish in order to finance your mission. Drag the fish you want to sell to the sale tank and click the sell fish button.