Welcome to Fish Tycoon forum

You need to research environment. After that the fish will live long enough to sell. before that, though, you may be over crowding your tanks. Just sell regular fish until you have enough money to research.

To auntox6361-you don't need a new registration key-you can use the old one-if you go to your accounts section and the click on the tab to see all your game downloads you can download Fish tycoon again and input your email and password, but if you do need the registration key contact Tech support.