Fishing boats are anchored at a port in Rizhao, east China's Shandong Province, June 1, 2014. A three-month fishing ban started on Sunday in north China's Bohai and Huanghai seas. (Xinhua/Zhang Lei)

A fisherman settles the fishing equipment at a port in Yantai, east China's Shandong Province, June 1, 2014. A three-month fishing ban started on Sunday in north China's Bohai and Huanghai seas. (Xinhua/Li Zhiyong)

A frontier guard sets the sign to show the anchoring area for fishing boats at a port in Qingdao, east China's Shandong Province, June 1, 2014. A three-month fishing ban started on Sunday in north China's Bohai and Huanghai seas. (Xinhua/Yu Fangping)

Fishing boats are anchored at a port in Tianjin, north China, June 1, 2014. A three-month fishing ban started on Sunday in north China's Bohai and Huanghai seas. (Xinhua/Yue Yuewei)

 Fishing boats are anchored at a port in Tianjin, north China, June 1, 2014. A three-month fishing ban started on Sunday in north China's Bohai and Huanghai seas. (Xinhua/Yue Yuewei)