China has the world’s largest and farthest-ranging fishing operation, outstripping the next 10 biggest combined, according to what researchers say is the most comprehensive and data-intensive study on the subject.
Ships from China amassed approximately 17 million hours of fishing in 2016, mostly off the southern coast of their home country, but also as far away as Africa and South America. The next-biggest operation is Taiwan’s, with 2.2 million hours of fishing.
The data, collected and analyzed over five years by Global Fishing Watch, a non-profit that tracks fishing operations, represent the most comprehensive look at where, and how often, the world’s fishing boats operate. A study of the data is being published in the journal Science on Thursday.
China is “the most important fishing nation,” Global Fishing Watch research and development director David Kroodsma, who was the study’s lead author, said in an interview. “The extent of the Chinese fleet is even bigger than it seems.”
China’s distant-water fishing fleet, estimated as the world’s largest by Greenpeace, with 2,500 vessels, has not always been welcome in far-off waters. Ships are not allowed to work without permission in the exclusive economic zones of other countries, which extend by UN convention to 200km from shore.
Chinese trawlers were last year seized off Senegal, Guinea, Sierra Leone and Guinea Bissau over illegal fishing. Argentina’s coast guard in 2016 sank a Chinese trawler that was fishing illegally within its territorial waters.
The Chinese Ministry of Agriculture did not immediately respond to requests for comment on the activities of China’s fishing fleets.
The waters off China’s coast, and those of northern and southern Europe, are the most heavily fished, the study found.
Funding sources for the study included the Leonardo DiCaprio Foundation, Bloomberg Philanthropies, the Wyss Foundation, the Waterloo Foundation and the Adessium Foundation.
The project’s next steps would be to take the data and see how they can be applied to policy and additional research, Kroodsma said.
For instance, researchers are comparing maps of different species of fish with the areas where various fleets are operating.
“People ask, ‘Are we overfishing?’ People ask, ‘What kinds of regulations are good ones versus bad ones? How do fishermen respond to subsidies?’” he said. “All these questions about how we manage the oceans, we can now answer. We can bring data to the table.”
Previous studies have inferred fishing activity rather than directly studied it, he said, but added that the advent of wide-ranging commercial satellite coverage, plus access to data from ships’ transponders, allowed the Global Fishing Watch researchers to paint a much more detailed picture.
“People have been fishing the oceans for over 40,000 years,” Kroodsma said. “But it’s just now that we can really get a good picture. It’s just one of these moments that where we’re taking a huge step forward.”
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