Summary screen:
Press Up(2), Down(2), L1, R1, L1, R1, X, Circle, Start at the title screen, . Enter the options screen and press Select to display screen with number of games, line breaks, fish count, and types of fish caught.

Catch more fish:
Press Triangle, X, Circle, Square, Up, Down, Left, Right at the title screen. The sound of a splash will confirm correct code entry.

Concave Dam:
Play the game fifty times. This does not have to be in tournament mode, and may be done in practice mode. To make this easier, go to the options screen and change the turning time to 60 seconds and set the difficulty to easy. When you are playing, just wait until the timer runs out and that will count as playing the game one time. To see how many times you have played go to the options screen and press Select. After fifty games, choose the "Start New Training" option and the secret level will be there.

Center lake:
Play the game at least one hundred times.

Examine your fish:
After catching a fish, a screen that shows the fish, its type, and weight will appear. Use the D-pad to turn the fish left and right and move it up and down.