River Mystery: What Is Killing the Giant Sturgeon of BC’s Nechako River?

A white sturgeon is seen in B.C. waters after being captured during sampling by the Fraser River Sturgeon Conservation Society in an undated handout photo. The Canadian Press/HO-Fraser River Sturgeon Conservation Society

Fisheries scientists in British Columbia have recovered the bodies, but have few other clues and no prime suspect.

So what is killing the giant sturgeon of the Nechako River?