On the computer screen, 30,000 cod are swimming about in the dim green waters of the Gulf of Maine, circling the perimeter of their enormous cage. They're 40 feet below the North Atlantic swell, six miles off the New Hampshire coast. Fed by an automated buoy and submerged deeply enough as to be protected from passing ships and storms, the fish spend days at a time without human contact, their progress monitored by video cameras mounted in their enormous, 50-foot tall, saucer-shaped cage.
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