(FILES) This file photo taken on September 22, 2014, shows fish swimming through the coral on Australia's Great Barrier Reef. Populations of marine mammals, birds, reptiles and fish have dropped by about half in the past four decades, with fish critical to human food suffering some of the greatest declines, WWF warned on September 16, 2015. In a new report, the conservation group cautioned that over-fishing, pollution and climate change had significantly shrunk the size of commercial fish stocks between 1970 and 2010. AFP PHOTO/William WEST (Photo credit should read WILLIAM WEST/AFP/Getty Images)
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AFP WILLIAM WEST