In 2019, Australia restored oyster habitat that had nearly disappeared; years later, 34 million oysters filtered 9 million litres of seawater hourly

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.

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