The intrusion of Chinese fishermen into Korean waters is becoming more brazen by the day because demand in China is soaring due to its rapid economic growth, while pollution and overfishing have nearly killed off fish stocks near the Chinese coast.
Fish farms along the Chinese coast are seeing a rapid drop in productivity due to pollution spewed into the ocean from massive port and petrochemical facilities, so the trawlers venture ever further out into the exclusive economic zones or territorial waters of Korea and Japan.
Until Korea and China signed a fisheries pact in 2001, Chinese fishermen cast their nets freely inside Korea's EEZ. Since then they have been given a quota and have to pay to fish in Korea's EEZ. But they simply ignore the law to save money.
China's consumption of marine products amounts to one thirds of the world/s total.