Moreton Bay in Southeast Queensland has globally-important biodiversity including seabird, turtle and dugong populations, and supports 15% of Queensland's commercial fishing. It is surrounded by the fastest growing population in Australia, which brings with it the challenges of managing nutrient and sediment loads. In this study, we investigate the important role that zooplankton plays in the cycling of nutrients in the Bay. Using monthly data on zooplankton species composition, growth rates, and size structure, we will provide the first robust estimates of zooplankton abundance and rate processes from the Bay and develop indicators of nutrient enrichment. These findings should prove useful for validating the next-generation of ecosystem models for the Bay and could provide new indicators for water quality monitoring.