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Oysters Return to Dublin Bay After 200 Years!
27 Sep
Summary
- Over 18,000 native oysters were reintroduced to Dublin Bay.
- Oysters will improve water quality and aid marine restoration.
- The project aims to establish a self-sustaining oyster reef.
Native oysters have been reintroduced to Dublin Bay after a 200-year absence, marking a significant step in marine restoration efforts. In November 2025, over 18,000 adult native oysters were released into Dún Laoghaire Harbour in specialized floating baskets.
This initiative, spearheaded by the Green Ocean Foundation, focuses on ecological restoration rather than commercial harvesting. The oysters' primary role is to filter seawater, improving water clarity and supporting marine plant life.
As the oysters grow, their shells will form the foundation of a living reef. This reef structure is expected to stabilize the seabed and mitigate wave energy, offering natural coastal protection.
The project, which began its initial trials in November 2023, has already observed successful oyster reproduction and settlement. The goal is to establish a self-sustaining broodstock within Dublin Bay.
Experts predict that fully established oyster reefs could take 15 to 20 years to develop. The DCU Water Institute is monitoring the project, which has shown strong oyster growth and survival rates.
