Photo taken on April 30, 2021 shows fishing vessels sail back to a port before the enforcement of annual summer fishing ban, at Jinqing Town of Luqiao District in Taizhou, east China's Zhejiang Province. The annual summer fishing ban, covering the Bohai Sea, the Yellow Sea, the East China Sea, and the waters north to 12 degrees north latitude of the South China Sea, started Saturday.Photo:Xinhua

A fisherman transfers his fishing gear from boat before the enforcement of annual summer fishing ban, at a port in Lianyungang, east China's Jiangsu Province, April 30, 2021. The annual summer fishing ban, covering the Bohai Sea, the Yellow Sea, the East China Sea, and the waters north to 12 degrees north latitude of the South China Sea, started Saturday. Photo:Xinhua

Aerial photo taken on April 30, 2021 shows fishing vessels berthed at a port in Ganyu District of Lianyungang, east China's Jiangsu Province. The annual summer fishing ban, covering the Bohai Sea, the Yellow Sea, the East China Sea, and the waters north to 12 degrees north latitude of the South China Sea, started Saturday.Photo:Xinhua

Aerial photo taken on April 30, 2021 shows fishing vessels sailing back to Shenjiamen port before the enforcement of annual summer fishing ban, in Putuo District of Zhoushan City, east China's Zhejiang Province. The annual summer fishing ban, covering the Bohai Sea, the Yellow Sea, the East China Sea, and the waters north to 12 degrees north latitude of the South China Sea, started Saturday.Photo:Xinhua