Over the last 200 years, destructive harvesting practices have resulted in the decline of oyster reefs globally. In southern Australia, Angasi oysters (Ostrea angasi) was once abundant but has also undergone drastic declines in distribution and abundance. A key concern for this species is the lack of suitable substrate for settlement across its historical subtidal and intertidal distribution and high predation of juveniles. To address this, we assessed the survival of O. angasi of three ages and seededin different densities across a tidal gradient and within and outside microhabitats that provide refugia. Survival was consistent across a tidal gradient with microhabitats doing little to mitigate predation. This study provides insight into how density, habitat complexity and tidal elevation interact with the survival of O. angasi. The findings from this research will help to inform artificial reef design for future restoration projects.