Fishing boats are anchored in the harbour in Qingdao City, east China's Shandong Province, May 31, 2016. Annual fishing ban will start from June 1 on China's Yellow Sea, Bohai Sea and the East China Sea. (Xinhua/Wang Haibin)

Fishing boats are anchored in the harbour in Qingdao City, east China's Shandong Province, May 31, 2016. Annual fishing ban will start from June 1 on China's Yellow Sea, Bohai Sea and the East China Sea. (Xinhua/Wang Haibin)

Fishing boats are anchored in the harbour in Qingdao City, east China's Shandong Province, May 31, 2016. Annual fishing ban will start from June 1 on China's Yellow Sea, Bohai Sea and the East China Sea. (Xinhua/Wang Haibin)

A fisherman settles the fishing net in the harbour in Qingdao City, east China's Shandong Province, May 31, 2016. Annual fishing ban will start from June 1 on China's Yellow Sea, Bohai Sea and the East China Sea. (Xinhua/Wang Haibin)

Fishing boats are anchored in the harbour in Qingdao City, east China's Shandong Province, May 31, 2016. Annual fishing ban will start from June 1 on China's Yellow Sea, Bohai Sea and the East China Sea. (Xinhua/Wang Haibin)