Salmon are born in fresh water but travel to salt water to live their lives and then travel back upstream to where they spawn more salmon before they die. Salmon traveling upstream are very determined to get back to where they were born. They fight against currents, whirlpools, and waterfalls; even though, man has placed some obstacles in the salmon's way by building dams or rivers. Once the salmon reaches its birthplace, it lays eggs. These eggs hatch, and the process begins again.