https://phys.org/news/2020-07-exposes-rampant-illegal-fishing-north.html
By combining satellite data, artificial intelligence and on-the-ground expertise, Global Fishing Watch uncovered the largest known case of illegal fishing perpetrated by vessels originating from one country operating in another nation's waters.
Credit: © Global Fishing Watch
The study, "Illuminating Dark Fishing Fleets in North Korea," found that more than 900 vessels of Chinese origin in 2017 and 700 in 2018 likely violated United Nations sanctions by fishing in North Korean waters. The vessels likely caught almost as much Pacific flying squid as Japan and South Korea combined—more than 160,000 metric tons worth over US $440 million in 2017-2018.
"The scale of the fleet involved in this illegal fishing is about one-third the size of China's entire distant water fishing fleet. It is the largest known case of illegal fishing perpetrated by vessels originating from one country operating in another nation's waters," said Jaeyoon Park, senior data scientist at Global Fishing Watch and co-lead author of the study. "By synthesizing data from multiple satellite sensors, we created an unprecedented, robust picture of fishing activity in a notoriously opaque region."
Following North Korea's testing of ballistic missiles, the U.N. Security Council adopted resolutions in 2017 to sanction the country, and some of these prohibit foreign fishing.
The detected vessels originate from China and are assumed to be owned and operated by Chinese interests. However, because these vessels often do not carry appropriate papers, they are likely "three-no boats"— operating without official Chinese authority, with no registration, flag, or license.
Devastating impact on North Korean small-scale fishers
The study also found about 3,000 North Korean vessels fished illegally in Russian waters in 2018.
Using multiple satellite sensors, Global Fishing Watch's new Science Advances study reveals rampant illegal fishing in one of the world's most disputed and least monitored waters. Credit: © Global Fishing Watch
"Competition from the industrial Chinese trawlers is likely displacing the North Korean fishers, pushing them into neighboring Russian waters," said study co-lead Jungsam Lee of the Korea Maritime Institute. "The North Koreans' smaller wood boats are ill-equipped for this long-distance travel."
Hundreds of North Korean boats have washed ashore on Japanese and Russian coasts in recent years. These incidents often involve starvation and deaths, and many fishing villages on North Korea's eastern coast have now been coined "widows' villages."
"The consequences of this shifting effort for North Korean small-scale fishers are profound, and represent an alarming and potentially growing human rights concern," said co-author Katherine Seto, an assistant professor of environmental studies at the University of California, Santa Cruz.
Rogue vessels plunder squid as catch declines
The study claims the previously unidentified vessels pose a huge challenge for squid stock management, with reported catches plummeting by 80 percent and 82 percent in South Korean and Japanese waters respectively since 2003. Pacific flying squid is South Korea's top seafood by production value, one of the top five seafoods consumed in Japan and, until recent sanctions, was the third largest North Korean export.
Disagreement over boundaries in the waters between the Koreas, Japan and Russia have prevented joint fisheries management and hampered national efforts due to a lack of comprehensive stock assessments.
"Illegal fishing in these waters is a very serious matter in Japan, and the lack of shared data and management is a major challenge considering the critical importance of squid in the region," said Masanori Miyahara, President of the Japan Fisheries Research and Education Agency. "We must face this challenge using the evidence provided by this study and other credible science."
A satellite image of pair trawlers in North Korean waters. Grey ovals show where the neural net classifier identified pair trawlers. In this area, Global Fishing Watch received AIS messages from several vessels (only two shown). White lines connect their most recent AIS position to the estimated position during the time of the satellite image, based on extrapolating the vessel's speed and course. In white is the 9-digit Maritime Mobile Service Identity (MMSI) of each vessel.
Credit: © Planet
"These novel insights are now possible thanks to advances in machine learning and the rapidly growing volume of high-resolution, high-frequency imagery that was unavailable even a couple of years ago." said David Kroodsma, research and innovation director at Global Fishing Watch and co-author of the study. "We've shown we can track industrial fishing vessels that are not broadcasting their locations."
New analysis could underpin inter-Korean cooperation
The 2018 inter-Korean summits underlined the need to build peace through cooperation on the waters, create a joint fisheries management area, and address illegal fishing. Achieving these laudable ambitions will rely on unbiased information that all sides can trust.
"Global fisheries have long been dominated by a culture of unnecessary confidentiality and concealment. Achieving a comprehensive view of fishing activity is an important step toward truly sustainable and cooperative fisheries management, and satellite monitoring is a key part of the solution." said Associate Professor Quentin Hanich of the Australian National Center for Ocean Resources and Security (ANCORS) at the University of Wollongong and co-author. "This analysis represents the beginning of a new era in ocean management and transparency."
The study was itself an example of international cooperation, with scientists from South Korea, Japan, Australia and the United States collaborating to reveal fishing activity in the region.
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