Officials found the toxin microcystin in the blue-green algae present at Discovery Bay, Calif. For people exposed to the toxin, symptoms include dizziness, rashes, fever, vomiting and in more unusual cases, numbness. Lesley McClurg/KQED hide caption

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Poisonous Algae Blooms Threaten People, Ecosystems Across U.S.

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Freshly cooked Dungeness crab sits on a pot of boiling water at Nick's Lighthouse Restaurant in San Francisco, Nov. 5, 2015. Justin Sullivan/Getty Images hide caption

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Paul Herringshaw says farmers like him have been taking steps to reduce crop runoff for years. Sarah Jane Tribble/WCPN hide caption

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Lake Erie's Toxic Bloom Has Ohio Farmers On The Defensive

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