Four-year study suggests only a third of tagged fish made it through Whitehorse fish ladder

Four-year study suggests only a third of tagged fish made it through Whitehorse fish ladder

By Haley Ritchie

Source: yukon news

2/9/2021

As a four-year study on Chinook salmon in the Yukon wraps up, the researcher says he is hoping it might raise questions about how fish are navigating the Whitehorse fish ladder.

William Twardek, a PhD candidate from Carleton University, has spent four years studying how the Upper Yukon River Chinook salmon manoeuvered around the Whitehorse hydro dam.

“The objective of this wasn’t so much to necessarily find solutions or change the design of the fish ladder, its real focus was to provide an evaluation as to how well the fish ladder is working,” Twardek said.

The results of Twardek’s study haven’t been published yet, but he is sharing preliminary results with the community.

Chinook are considered strong swimmers, but the salmon in the Yukon River already work very hard to get to the fish ladder. Entering the river in Alaska, the salmon travel nearly 3,000 kilometres to get to their home spawning sites, making it one of the longest inland salmon migrations on earth.

Yukon River

Salmon, Chinook

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