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Can governments and businesses exploit the untapped economic potential of the seas without damaging its complex ecosystems? Tanya Beckett reports from the World Ocean Summit in Portugal. She speaks to Assuncao Cristas, Portugal's minister for agriculture and the sea, Maria Damanaki, managing director for oceans at the Nature Conservancy, Catherine Novelli, US Under-Secretary for economic growth, energy and environment, and Marco Lambertini, director general of the WWF.

Plus, Paul Ross reports on the fishermen persuaded to catch less to protect the long-term future of their industry. And Brian Sullivan from Google outlines the tech giants new Oceans project.

(Photo: Newhaven Lighthouse battered by waves in Newhaven, England. Credit: Glyn Kirk/AFP/Getty Images)