Farmers harvest oysters at the oyster cultivation fields in Qinzhou City, south China's Guangxi Zhuang Autonomous Region, July 20, 2019. With the advantage of the location of Maoweihai natural harbor, Qinzhou has developed an oyster industry which has a cultivation field of 158,000 Mu (about 10,533 hectares) and a complex output value of about 3,000 million Yuan (435.97 million US dollars). (Xinhua/Zhang Ailin)

Farmers harvest oysters at the oyster cultivation fields in Qinzhou City, south China's Guangxi Zhuang Autonomous Region, July 20, 2019. With the advantage of the location of Maoweihai natural harbor, Qinzhou has developed an oyster industry which has a cultivation field of 158,000 Mu (about 10,533 hectares) and a complex output value of about 3,000 million Yuan (435.97 million US dollars). (Xinhua/Zhang Ailin)

Farmers harvest oysters at the oyster cultivation fields in Qinzhou City, south China's Guangxi Zhuang Autonomous Region, July 20, 2019. With the advantage of the location of Maoweihai natural harbor, Qinzhou has developed an oyster industry which has a cultivation field of 158,000 Mu (about 10,533 hectares) and a complex output value of about 3,000 million Yuan (435.97 million US dollars). (Xinhua/Zhang Ailin)

Aerial photo taken on July 20, 2019 shows the oyster cultivation fields in Qinzhou City, south China's Guangxi Zhuang Autonomous Region. With the advantage of the location of Maoweihai natural harbor, Qinzhou has developed an oyster industry which has a cultivation field of 158,000 Mu (about 10,533 hectares) and a complex output value of about 3,000 million Yuan (435.97 million US dollars). (Xinhua/Zhang Ailin)

Farmers harvest oysters at the oyster cultivation fields in Qinzhou City, south China's Guangxi Zhuang Autonomous Region, July 20, 2019. With the advantage of the location of Maoweihai natural harbor, Qinzhou has developed an oyster industry which has a cultivation field of 158,000 Mu (about 10,533 hectares) and a complex output value of about 3,000 million Yuan (435.97 million US dollars). (Xinhua/Zhang Ailin)

Aerial photo taken on July 20, 2019 shows the oyster cultivation fields in Qinzhou City, south China's Guangxi Zhuang Autonomous Region. With the advantage of the location of Maoweihai natural harbor, Qinzhou has developed an oyster industry which has a cultivation field of 158,000 Mu (about 10,533 hectares) and a complex output value of about 3,000 million Yuan (435.97 million US dollars). (Xinhua/Zhang Ailin)