How come one in every four fish is caught illegally?

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Interpol describes its efforts to police the world's oceans. Per Erik Bergh from Stop Illegal Fishing tells Manuela Saragosa the world's vast oceans are still relatively unprotected from a crime which is sometimes tied up with drugs and human trafficking. And Alistair McDonnell, from Interpol's fisheries unit, describes the efforts to police the high seas. (Picture: An Indonesian Navy officer targets a fishing boat. Credit: SEI RATIFA/AFP/Getty Images)