Note from the box:

Players in turn roll the die and then simultaneously try to catch the fish shown on the die. If a wrong fish has been caught it must be back into the ring. The first player to catch 2 fish has won the game. For smaller children the die can beleft out, the game ends when all fish have been caught, the player with the most fish wins the game. If more than two are playing, everybody plays against everybody else, who wins the most duels?