Shark Tale cheats and cheat codes for Playstation 2

Invincible mode:
Press Select during gameplay, then hold L1 and press 
X, Circle, X, Left, Left, Square, R1, Down, Square, Square

Attack mode:
Press Select during gameplay, after hold L1 and press 
Circle, Circle, Circle, Circle, X, Circle, Circle, Circle 
or 
Circle, Circle, Circle, Circle, X, Circle, Circle, Circle, Circle

2 bonus fame and clams:
Press Select during gameplay, after hold L1 and 
press Circle, Circle, X, X, Circle, X, Circle, Circle

Fish King coins instead of Pearls: 
Press Select, during gameplay on any level with Pearls, after 
hold L1 press Circle, X, Circle, Circle, Circle, X, Circle, Circle

Complete the dance mode easier:
Press X + Square + Circle + Triangle on each arrow

Chapter 3: Easy pearls:
Attack the puffer fish. You can pick up many pearls.
To win in dancing mode, press the buttons when they get to the circle.

Shorties: 
If you can't beat them, try to following Shorties.

Destroyable creatures:

You can destroy:
crabs, puffer-fish, guard fish, piranhas, electric eels, angler fish. 

You cannot destroy:
jellyfish, sea urchins, bus fish, long eels.