It happened Thursday night and into Friday morning, when the Crown corporation reduced the spill release from the Daisy Lake Reservoir into the river, stranding fish who had moved closer to the banks.
There was a slight rise in population numbers of the very rare animals last year.
Karen Dunmall, a biologist with Fisheries and Oceans Canada, said pink salmon normally prefer warmer waters than the Arctic has been able to provide. But with the Arctic warming at up to three times the rate of the rest of the world, its waters are becoming more approachable for newcomers like this species.
Swarms of giant jellyfish are floating along the coastline of the Sea of Japan, and the damage they may cause to fisheries is feared to be the worst in more than a decade.
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