Aerial photo shows a national marine ranch in Rongcheng City, east China's Shandong Province, July 15, 2020. In summer, marine ranches in Rongcheng enter tourist season. The city in recent years has invested in marine economies, including building marine ranches, to boost tourism. (Xinhua/Wang Kai)

Aerial photo shows a national marine ranch in Rongcheng City, east China's Shandong Province, July 15, 2020. In summer, marine ranches in Rongcheng enter tourist season. The city in recent years has invested in marine economies, including building marine ranches, to boost tourism. (Xinhua/Wang Kai)

Aerial photo shows a national marine ranch in Rongcheng City, east China's Shandong Province, July 15, 2020. In summer, marine ranches in Rongcheng enter tourist season. The city in recent years has invested in marine economies, including building marine ranches, to boost tourism. (Xinhua/Wang Kai)

Aerial photo shows a national marine ranch in Rongcheng City, east China's Shandong Province, July 15, 2020. In summer, marine ranches in Rongcheng enter tourist season. The city in recent years has invested in marine economies, including building marine ranches, to boost tourism. (Xinhua/Wang Kai)