Visitors watch a performance in front of the giant aquarium of Aqua City, the new flagship marine-themed zone of the Hong Kong Ocean Park, during its opening ceremony January 26, 2011. [Photo/Agencies]

Visitors stand in front of a giant aquarium at its opening in Aqua City, the new flagship marine-themed zone of the Hong Kong Ocean Park January 26, 2011. The aquarium features some 5,000 marine animals of over 400 species. [Photo/Agencies]