The Chinese sturgeon were introduced to the park in 2008, and as at 2013, Ocean Park houses nine Chinese sturgeons, displayed in Chinese Sturgeon Aquarium – Yangtze Exploration. To mark China's hosting the Olympic Games, the Chinese Central Government made a gift of five rare Chinese sturgeon, symbolising the five Olympic rings, with Ocean Park as the recipient. Two were bred by the Yangtze River Fisheries Research Institute and three by the Beijing Aquarium. The fish made their debut on 20 June 2008. However one of them died after a few days, apparently bitten by a barracuda. On 14 July 2008, it was announced that Hong Kong would receive another five sturgeon from the Chinese National Aquatic Wildlife Conservation Association in time for 8 August opening ceremony, to complement the four fish already in situ. The park's management opted to evict its sharks from their aquarium in favour of the new arrivals. On 12 December 2008, a second sturgeon died from an infection. A third one died from an injury and two nine-year-old sturgeon were found to be ill in January 2009. The two sick fish, measuring 2.3m and 1.5m, were returned to the Yangtze River Fisheries Research Institute for expert care.