As discussed in the mass extinction chapter of the book, over-fishing is a gigantic threat in the world’s oceans. At the current pace of industrial fishing, the oceans will soon be stripped bare. And China is one of the key offenders when it comes to over-fishing:

Giant Chinese fishing fleet depletes stocks around world

China’s exploitation of the world’s fish stocks is far greater than previously thought, with research showing the country has more than 12,000 vessels fishing beyond its waters, three times more than previous estimates.

The Chinese fleet is the biggest contributor to the “global fisheries crisis”, which has resulted in two thirds of the world’s commercial stocks being overfished or fished to the limit, according to a report by the Overseas Development Institute, a think tank.

One approach described in the book would be to ban industrial fishing to allow ocean species to recover and to switch to aquaculture. See the mass extinction chapter of the book for details.