Chewing on their favourite branches of Guangdong bamboo in their new $80 million home, national treasures An An and Jia Jia made their long-awaited debut at Ocean Park yesterday. Tung Chee-hwa praised the two as symbols of China while State Councillor Wu Yi said they were emblems of peace. 'The pandas are gifts from the central Government and a proof of how important the mainland considers Hong Kong,' Mr Tung said at the opening ceremony of the pandas' habitat, which is kept at 15 to 18 degrees Celsius and will cost $9 million a year to run. The pandas will be revealed to the public today when the enclosure will open with the rest of Ocean Park from 10am to 6pm. An An, the 14-year-old male, and Jia Jia, 21, each eat 15 to 20 kilograms of bamboo a day, and supplies have to be flown in twice a week from Guangdong. They are also fed high-fibre biscuits. Habitat curator Timothy Ng Sau-kin said the pair were healthy but unlikely to mate. 'They haven't shown interest in each other and according to convention, pandas selected to be exported outside of the mainland are not as productive as those inside,' he said. Jia Jia has had six cubs, of which four survived, but the last birth was in 1996 when she was the oldest known panda to become a mother. An An, described as 'active and playful' weighs in at a burly 95kg. He has been a jetsetter, living in Singapore and Shenzhen since being rescued from the wild at two months old.