The Macleay River is a typical oyster farming estuary that experiences a range of water quality issues. For the first time, this project will collect and analyse very detailed water quality information from this estuary that will be used to build predictive models to show the impact of poor water quality events, such as flooding, bushfire runoff, acid sulphate runoff, de-oxygenated water, disease, low salinity and sewage spills, on estuaries farming Sydney rock and pacific oysters. The project team has collected new biological and physical data from the Macleay estuary using a real time temperature and salinity sensor, oysters and water samples. Modelling will inform discussions with oyster farmers, regulators, government, researchers, councils and other industry groups, and help demonstrate how real time environmental sensing data is acceptable and applicable for use by shellfish safety regulators.