Parasite Threat to Yukon Salmon | Anchorage News

A deadly parasite called Ichthyophonus is decimating Yukon River Chinook salmon, turning them into mushy, spotted carcasses and triggering fishing closures. Longtime researcher Stan Zuray first spotted the decline decades ago, and now scientists confirm the parasite—thriving in warmer waters—is a major driver of salmon die-offs, especially as climate stressors weaken the fish. The collapse isn’t just ecological—it’s a cultural and economic catastrophe for Indigenous and fishing communities who rely on these fish for survival, tradition, and income. Researchers are racing to develop non-lethal tests to track the parasite’s spread, while warming waters threaten salmon populations across Alaska and beyond, turning a local crisis into a global warning.

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