Performers dressed as mermaids use lanterns during an underwater performance to celebrate the upcoming Mid-Autumn Festival at Dong Hu Sea World in Wuhan city, Central China's Hubei province, Sept 9, 2011. During the festival, which falls on the 15th day of the eighth month on the Chinese lunar calendar, Sept 12 this year, Chinese people eat mooncakes and go out to admire the moon, when the moon is at its fullest and roundest. [Photo/Xinhua]