Chapter 9: Avoid being caught
To avoid being caught by police fish, go into houses until the cops pass.
Chapter 9: Staying hidden
When you must sneak around the fish with lights on their heads or the ones with torches, there are some tables with cloths on them that you can go under without being detected.
Destroyable Creatures
You can destroy crabs, puffer-fish, guard fish, piranhas, electric eels, and angler fish. You cannot destroy jellyfish, sea urchins, bus fish, and long eels.
Chapter 3: Pearls...