Infinite Time:
When the start screen begins to appear if you press: A, B, Y, X, Y, A, B, Left, Right, Y, X, A, B, A, Y, X, Y. You will hear "FISH"

Change lure color:
In Consumer Mode, press Up or Down to change lure color.

Alternate Clothes and Boat Color:
Reach the final tournament in original mode for new clothes and boat color.

Extra Practice levels:
Beat the game in arcade mode to open up three new practice levels.

Be a woman:
At the level select screen, press A+B simultaneously to be a woman.

Sonic Lure:
Beat all five tournaments in consumer mode.

GameShark Codes

Complete Arcade Mode Quickly 
C46BE50F
0000A000 

No Line Tension 
BEBE387E
00004300 

Thanks to Revolution readers Michael Burkett, MStanko, Sam, mbabiak, Aaron Richards and Chris!