 When Henry Hudson first arrived in New York Harbor in 1609, he came upon an unimaginable bounty of oysters. He described oysters as large as dinner plates. Experts estimate there were more than 220,000 acres of oyster beds, about half of all the oysters in the world. Now, oysters' best days in New York City are long gone. Experts are trying to bring them back. There's some fish in there.