the indo-pacific humpback dolphin is listed on appendix ii of the convention on the conservation of migratory species of wild animals (cms). it is listed on appendix ii as it has an unfavourable conservation status or would benefit significantly from international co-operation organised by tailored agreements. in the interim of 2003–2013, the number of these dolphins in the bay around hong kong has dwindled from a population of 159 to just 61 individuals, a population decline of 60% in the last decade. the population continues to be further threatened by pollution, vessel collision, overfishing, and underwater noise pollution.