They 'imprint' the chemical composition of the stretch of water where they hatch. Once they reach adulthood (after swimming in the oceans) they use this imprinted knowledge to 'home in' on the river where they hatched.
Exactly where they were born
exactly 2.09288277 ft.
Salmon Sakeyama was born in 1970.
Cecil Salmon was born in 1885.
Herman Salmon was born in 1913.
Roxroy Salmon was born in 1956.
Ross Salmon was born in 1964.
Robert Salmon was born in 1775.
Benoît Salmon was born in 1974.
George Salmon was born in 1819.
Graham Salmon was born in 1954.
Ted Salmon was born in 1943.