They use a compass. Bigger fish direct them to the right address. They stay in the river for one year as the salmon young grow. The female dies and the male remains to raise the young. Both the male and female salmon die.
Pacific salmon are anadromous fish.
Salmon are acrobats. Salmon live in both fresh and salt water for parts of their lives. Salmon like to explore. Makes them swim faster. Camouflage it in the gravel, protecting it from predators.