Ecosystems on the Edge: Low Oxygen

Oysters have been hard hit by overfishing and poaching. Now they have another enemy: low-oxygen "dead zones" that emerge in shallow waters at night. Smithsonian biologist Denise Breitburg explains how even just a few hours with near-zero oxygen levels can leave them vulnerable to parasites and disease.
View more Ecosystems on the Edge videos and learn how you can help at ecosystems.serc.... Created by the Smithsonian Environmental Research Center.

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