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- Drain the aquarium
When the seaman gets old enough he will help you move the rock to drain the aquarium.
- Give your Seaman a new name
After naming your Seaman the first time, repeatedly ask "Do you love me?". Eventually, you will be able to change your Seaman's name.
- Hidden audio
Place the game disc in an audio CD player and play track two to hear a hidden message.
- Hypnotize Seaman
Select a Seaman and move the Analog-stick in circles around its head.
- Infinite food
Note: This trick requires two VMUs. Start and save a new game using a second VMU. Connect this VMU to a VMU that has an ongoing game. Transfer the food from the new game to the ongoing game. Repeat this as needed for unlimited food.
- Keep him happy
Whenever you put the clock ahead on the VMU and you get back to where you left off except for a day or two later, add air and fix the heater. Then put the gillmen in a good mood! When you leave for that long they get mad and when they grow up, if you had never tickled them then they are very moody.