New Clothes And Boat Colours
Complete the game up to the final tournament in Normal mode to unlock new clothes and boat colours.
Fish at Mermaid Isle
If you catch a turtle in the first level, you will unlock the hidden Mermaid Isle icon, which should appear near the dock.
Fish As Super Chicken
At the Start Screen press up, up, down and hold in start to play as super chicken - the cyborg chicken. He has special bait and a larger pole.
When you catch fish in Arcade mode, you will automatically get special lures.