A recent study estimates how much fish China's distant-water fleet has been catching around the world between 2000 and 2011, and the numbers are shocking.
Why is it so hard to know how much fish China's long-distance fishing fleet is catching? Mostly because they keep contracts with other countries - especially African ones - secret, and they often operate with local flags on their ships. They also don't bring it all back to China; a lot is sold locally. Chinese ships have been found operating around countries where they officially report no catch.