A century ago, the oyster population could completely filter the water in Chesapeake Bay, the largest estuary in the USA, in three days. Today, it would take a year to filter the same amount of water, she says. Besides, oysters also create a kind of reef that other marine life depend on.

“Studies have shown that there are more than 300 species reliant on oyster reefs, including at least 12 species for their commercial or recreational value, such as blue crabs, sheepshead, croaker and stone crab

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