Scientists say they have solved the mystery of what killed more than 5 billion sea stars
- In 2025, scientists from the Pacific region uncovered the bacterial agent responsible for sea star wasting disease, solving a mystery that had persisted for 12 years.
- The marine epidemic began in 2013 and killed over six billion sea stars across 20 species from Alaska to Mexico, with sunflower stars hardest hit.
- The researchers targeted the fluid within the sea stars' bodies and identified Vibrio pectenicida as the confirmed bacterium responsible for the devastating disease.
- Melanie Prentice described sunflower stars as a keystone species whose loss caused sea urchin overpopulation and widespread kelp forest destruction.
- This breakthrough enables new studies on disease resistance, captive breeding, and reintroduction strategies to promote recovery and protect coastal ecosystems.
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The bacteria killing sea stars in the Pacific: How our team uncovered a decade-long mystery
A sunflower sea star in Knight Inlet on the British Columbia coast. (Grant Callegari/Hakai Institute)In 2013, a mysterious epidemic swept across the Pacific Coast of North America, rapidly turning billions of sea stars from Mexico to Alaska into goo. Its name, sea star wasting disease (SSWD), describes what you might have seen if you wandered the shores of the Pacific Northwest at that time: contorted sea star bodies and fragmented arms littered…
Scientists find culprit after billions of sea stars killed off Pacific Coast: ‘It’s really quite gruesome’
Scientists say they have at last solved the mystery of what killed more than 5 billion sea stars off the Pacific coast of North America in a decade-long epidemic.
·New York, United States
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Leaning Left52Leaning Right10Center89Last UpdatedBias Distribution59% Center
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C 59%
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