People watch salmons swimming upstream during their migration to the spawning grounds on Ganaraska River at Port Hope in Southern Ontario, Canada, on Oct. 12, 2019. (Photos: Xinhua)

A salmon tries to jump over a fish ladder as people watch beside during its migration to the spawning grounds on Ganaraska River at Port Hope in Southern Ontario, Canada, on Oct. 12, 2019.

Salmons swim upstream during their migration to the spawning grounds on Ganaraska River at Port Hope in Southern Ontario, Canada, on Oct. 12, 2019.

Salmons try to jump over a fish ladder during their migration to the spawning grounds on Ganaraska River at Port Hope in Southern Ontario, Canada, on Oct. 12, 2019.

A salmon tries to jump over a fish ladder during its migration to the spawning grounds on Ganaraska River at Port Hope in Southern Ontario, Canada, on Oct. 12, 2019.