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Underwater grasses and a crab pot near Crisfield, Md. In the Chesapeake Bay, underwater seagrass beds are growing, sheltering crabs and fish. The long-awaited recovery depends on efforts by farmers to prevent nutrients from polluting the giant estuary. Peter Essick/Getty Images/Aurora Creative hide caption

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Peter Essick/Getty Images/Aurora Creative

Dungeness crabs for sale at Fisherman's Wharf in San Francisco. California's Dungeness crab season was shut down in 2015, when record high ocean temperatures and lingering toxic algae blooms raised the domoic acid in shellfish to unsafe levels. A new study links dangerously high levels of the neurotoxin to warmer ocean temperatures, suggesting such closures could become more common in the future. Eric Risberg/AP hide caption

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Eric Risberg/AP