Colorful aquaculture nets are seen at a marine ranch in the sea near the Changdao Island, Penglai district, Yantai, Shandong province. The marine ranch industry is booming in Changdao Marine Ecological Civilization Comprehensive Pilot Zone. [Photo/cfp.cn]

A fishing boat is seen at a marine ranch in the sea near the Changdao Island. The zone has a marine ranching area of 271,000 mu (180.66 square kilometers), accounting for 23 percent of the province's total marine ranching area. [Photo/cfp.cn]

A seagull flies above a marine ranch in the sea near the Changdao Island. The island has a good environment. Water quality in more than 90 percent of the sea area meets first-class national standards. [Photo/cfp.cn]

A close-up of aquaculture net cages in the sea near the Changdao Island, Yantai, Shandong province [Photo/cfp.cn]

Colorful aquaculture nets create picturesque views in the sea near Changdao Island. [Photo/cfp.cn]