Redthroat emperor (Lethrinus miniatus) is an important species to fisheries of Australia, Japan, New Caledonia and Tonga, yet little is known about its movement patterns. Recent research has revealed variability in movement patterns among individuals, with no consistent patterns observed in presence or depth use related to individual size or time of day. Knowledge of how environmental conditions influence movement patterns of redthroat emperor is vital to better understanding response of this species to changes in climate. Utilising an acoustic telemetry network at three reefs combined with in-situ real-time monitoring of environmental conditions, this research investigates the vertical space use of redthroat emperor in relation to water temperature, tides, rainfall, air pressure and wind speed. Sixty adult individuals were fitted with Vemco V13P transmitters over three deployments, and monitored within a network of passive acoustic receivers in the southern Great Barrier Reef, Australia (April 2011-September 2013). Models compared environmental data with weekly and monthly vertical activity spaces and identified the environmental parameters that drive patterns in depth use. This study offers new insights into the ecology of this important species, and will allow managers to better predict the effect of environmental conditions on the movement patterns of this species.