Before you begin playing, print this datasheet. As you move through the watershed from the spawning grounds to the ocean, you will encounter perils that will reduce the number of fish in your school. The perils are listed on this datasheet. You can read more about each peril by clicking your mouse on the name of the peril. After each of your turns, record the number and percent of remaining fish in your school. Also decide if the peril is natural or caused by humans, and whether it is unavoidable or preventable. You may need to refer to this information after you complete the game.