Archaeozoological data from two New Zealand regions, Greater Hauraki in northern North Island and Otago-Catlins in southern South Island, are examined to document exploitation of the marine environment by Maori prior to European settlement. Data from 107 reliably dated archaeological assemblages are summarized to show the range of shellfish, finfish, marine bird and marine mammal taxa that were harvested and the relative importance of species within each of these classes. Regional differences in faunal spectra are detected and shown to be attributable chiefly to geographic variations in availability of taxa. Changes over time are apparent in the northern region, but are much less marked in the south. Marine mammals and birds disappear or decline in abundance, with human predation the most likely cause. Changes in the composition of shellfish and finfish harvests reflect changes in the location and organization of human settlements, driven largely by expanding demand for land suitable for horticulture.Keywords: archaeozoology; Maori prehistory; marine resources; human impacts; shellfish; finfish; coastal birds; marine mammals Introduction This paper summarizes archaeological data on human use of marine resources in two New Zealand study areas. The purpose is to assist in understanding the nature and causes of changes in coastal and marine shelf ecosystems over the timescale of human occupation. It is part of a broader collaborative project that is attempting to use knowledge of the past to improve future fisheries management. Led by Alison MacDiarmid of NIWA, the scope of this project is summarized by its title*Taking Stock: Longterm effects of climate variation and human impacts on the structure and functioning of New Zealand marine shelf ecosystems. This sets out to build a mass balance model of current coastal and marine shelf ecosystems in two study areas, and then estimate how it might have operated during five earlier time slices: