Auckland needs a single plan for its three harbours to go with a single plan for the city, says the Committee for Auckland lobby group.
The Auckland Council is proposing a marine spatial plan for the Waitemata and Hauraki Gulf, but is not addressing the environments and opportunities in the Kaipara and Manukau harbours, says committee executive director Heather Shotter.
A report, Three Waters: Auckland as a Maritime City, urges the council to develop a marine spatial plan for all three harbours and a simplified governance authority.
"Ignoring the social and economic potential of these harbours ... is like writing an Auckland Plan which excludes Waitakere," Ms Shotter said.
The Waitemata Harbour and Hauraki Gulf are governed by the Hauraki Gulf Forum, but there is no comparable body for the Manukau and Kaipara.