The Manukau Harbour (Auckland) is part of the rare Mauiâs dolphinâs natural habitat. Set netting around the harbour mouth was banned since 2003 to protect the endangered species. There has been controversy, particularly amongst fishermen, who say the dolphin does not venture into the harbour but results of a new survey prove otherwise. Mauiâs is New Zealandâs rarest dolphin, only found on the west coast of the North Island. There are thought to be less than 150 living in the wild. A three year study of the dolphins is being done by Otago Universityâs marine mammal research group.