A study of viral variants finds Piscine orthoreovirus continuously spills over from farmed salmon to wild salmon.
As climate change warms northern rivers and changes precipitation patterns, some types of cold-loving fish are failing.
Regulations have lowered mercury emissions globally, but the risks to ocean ecosystems and human health may be getting worse.
Pacific salmon are ingrained in the culture and economy of Canada. They are also a key link between ocean and land. But what happens if a pipeline failure contaminates their habitat?