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These oysters, collected from an estuary in Southern China, owe their blue color to contamination with metals including Cu, Zn, Ni, and Cr. Insufficient controls on industrial and domestic dumping into the water system threaten the viability of many Chinese villages that traditionally rely on rice and seafood for their meals, the researchers say. The blue oysters “are a cry for a national focus on metal pollution in estuaries in China.”

Credit: Environ. Sci. Technol. 2014, DOI: 10.1021/es503549b

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