Australia's oyster reefs once stretched extensively along the country's coastline, providing food and habitat for marine life and supporting Indigenous communities for thousands of years. European colonisation brought widespread destruction, with oyster shells harvested on a huge scale and burned to produce lime, while disease, fishing pressure and habitat loss further reduced reef ecosystems. By the modern era, less than 10% of Australia's original shellfish reef habitat was estimated to remain. In 2019, the New South Wales Government began restoring oyster reef habitat in Port Stephens, an estuary that had once supported extensive natural oyster beds. Rock was placed across 7.5 hectares of previously bare seafloor, creating hard surfaces for naturally occurring oyster larvae to settle on. The restoration began producing striking results within a few years: millions of oysters had colonised the reef, and researchers estimated that the growing population could filter about 9 million litres of seawater every hour. This groundbreaking restoration project exemplifies how strategic habitat reconstruction can rapidly reverse centuries of ecological damage, offering a promising model for coastal ecosystem recovery efforts across Australia.
Get breaking news anytime, anywhere. Download the TOI app now!
