Enter the case sensitive code 'maki' (without the quotes) to get some free fish.
If you want to avoid selling valuable fish you can tap the tank name to get an option appear that allows you to change the name and a box to tick if you want to lock the tank. When the tank is locked you cannot sell anything from it, but you can move things into the inventory.
As of Version 1.65 (June 2012) you can only restore the game two times per 24hr period. To restore the game click on the arrow icon to go to the 'Main' menu and then select 'About Tap Fish' and tap on 'Restore Game'.More Tap Fish Cheat Codes @ CheatListingsMore Tap Fish Cheat Codes @ AbsolutCheatsMore Tap Fish Cheat Codes @ CheatHappens