Salmons try to jump over a dam during their migration to the spawning grounds in Humber River in Toronto, Ontario, Canada, Oct. 18, 2020. Every autumn, thousands of salmons in many rivers in Ontario head upstream to spawn, attracting a large number of spectators and anglers. (Photo by Zou Zheng/Xinhua)

A man fishes salmons during their migration to the spawning grounds in Humber River in Toronto, Ontario, Canada, Oct. 18, 2020. Every autumn, thousands of salmons in many rivers in Ontario head upstream to spawn, attracting a large number of spectators and anglers. (Photo by Zou Zheng/Xinhua)

People watch a salmon jumping over a dam during its migration to the spawning grounds in Humber River in Toronto, Ontario, Canada, Oct. 18, 2020. Every autumn, thousands of salmons in many rivers in Ontario head upstream to spawn, attracting a large number of spectators and anglers. (Photo by Zou Zheng/Xinhua)

People watch salmons swimming during their migration to the spawning grounds in Humber River in Toronto, Ontario, Canada, Oct. 18, 2020. Every autumn, thousands of salmons in many rivers in Ontario head upstream to spawn, attracting a large number of spectators and anglers. (Photo by Zou Zheng/Xinhua)

People watch salmons swimming during their migration to the spawning grounds in Humber River in Toronto, Ontario, Canada, Oct. 18, 2020. Every autumn, thousands of salmons in many rivers in Ontario head upstream to spawn, attracting a large number of spectators and anglers. (Photo by Zou Zheng/Xinhua)

Anglers fish salmons during their migration to the spawning grounds in Humber River in Toronto, Ontario, Canada, Oct. 18, 2020. Every autumn, thousands of salmons in many rivers in Ontario head upstream to spawn, attracting a large number of spectators and anglers. (Photo by Zou Zheng/Xinhua)