Aerial photo taken on Sept. 23, 2019 shows ships loaded with oysters returning to the dock on the sea of the Guanglu Island in Changhai County of Dalian, northeast China's Liaoning Province. Dalian city has strengthened its efforts on constructing aquafarms in recent years, and the total area of aquafarms has reached about 360,000 hectares up to now. (Xinhua/Long Lei)