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.
George Salmon was born in 1819.
Graham Salmon was born in 1954.
Ted Salmon was born in 1943.
André Salmon was born in 1881.
Will Salmon was born on 1986-11-25.
Cecil Salmon was born in 1885.
Gaston Salmon was born in 1878.
Ben Salmon was born in 1889.
Ross Salmon was born in 1964.