Action Bass Codes -

Larger fish:
Pause game play, hold Select, and press L2, R2, R1, Up. Alternately, pause game play, hold Select, and press L2, R2, L1, R1, Up, Down.

Bonus levels:
Successfully complete challenge mode to unlock two more levels.

More lures:
A new lure will become available for each level in challenge mode that is completed.