Ahead of a study on the environmental impacts of the proposed Third Runway Project to be completed by the end of the year, the Hong Kong Airport Authority has released its findings on the potential impacts to the Chinese white dolphin population native to the Pearl River Estuary.
The study finds that reclamation works for the new runway will affect the usual movement patterns of the dolphins which forage around the waters off the Brothers Islands and Northwestern Lantau Island.
HKIA’s analysis claims that the population density and numbers of the dolphins in the areas north and west of the airport can only be classified as ‘medium’ and ‘low’. Overall data indicates a continual decline in the numbers of the white dolphin in the waters around the airport, with a longitudinal study released by HKIA yesterday finding that, within the waters of the proposed reclamation project, in the past year, a total of 215 dolphins were tracked in 62 pods, with each pod numbering 1 to 14 dolphins.
Additionally, the number of dolphins tracked in the areas north and west of the airport was recorded at an average of 11 dolphins per 100 km2, lower than the numbers of 67 and 44 dolphins per 100 km2 recorded by the Agriculture, Fisheries and Conservation Department off the coasts of northwestern and western Lantau Island respectively.

Chinese white dolphin sightings in Hong Kong. The proposed reclamation area is shown to be a hotspot for the dolphins. (Hong Kong Dolphin Conservation Society)
The HKIA, however, admits that if the project receives the go-ahead, the channel used by dolphins for moving between the waters of Long Kwu Chau and the Brothers Islands will be obstructed by the reclamation area jutting out into the channel, forcing their movement paths north.