Oysters are nature’s filtration machines, and there used to be enough of them in the Chesapeake Bay to filter and clean all that water in three days. Now, there are so few oysters it takes more than a year.
So, environmentalists are trying to rebuild the population by growing oysters. And one of the so-called oyster gardens is in an unlikely place-- Baltimore’s polluted inner harbor. It’s part of the Chesapeake Bay Foundation’s Baltimore Initiative.