Native oysters have made a return to Carrickfergus as part of efforts to restore Belfast Lough’s small but endangered population.
Over 900 mature native oysters (Ostrea edulis) have been suspended in 30 purpose-built cages over the edges of Carrickfergus Marina’s pontoons to help revive the species.
Led by local nature conservation charity Ulster Wildlife in partnership with Mid and East Antrim Borough Council, the restoration initiative could see up to 900 million oyster larvae released into surrounding waters every year.
In addition to supporting the expansion of wild populations, the oysters will help boost biodiversity and improve water quality by filtering pollutants.
Carrickfergus was once the heart of Belfast Lough’s thriving native oyster industry in the 1850s, home to the world-famous Carrick oyster. However, a combination of overfishing and disease led to their disappearance from Belfast Lough and beyond.
Funded by DAERA, the new nursery forms part of a network of native oyster nurseries in Belfast Lough, including Bangor Marina, Belfast Harbour, and Glenarm. Together, they aim to bring the native oyster back from the brink of extinction.
Dr Nick Baker-Horne, Marine Conservation Manager with Ulster Wildlife, highlighted the project’s importance:
“This is a significant step forward in helping to restore one of our most valuable native species. A growing native oyster population will have far-reaching benefits for the wider marine environment. These small but mighty creatures create vital habitat for juvenile fish as their larvae settle on the seabed and dramatically improve water quality - one oyster can filter a bathtub of water per day.”
The oysters, which were sourced from Loch Ryan in Scotland, underwent rigorous screening for disease and cleaning before being introduced to their new home at Carrickfergus Marina.
Karena Catterson, Harbour & Marinas Manager at Mid and East Antrim Borough Council, welcomed the nursery. She said:
“We are thrilled to be playing our part in restoring this endangered native species. Not only will this initiative help restore a species once abundant in these waters, but it will also improve water clarity, boost biodiversity, and celebrate Carrickfergus’ rich maritime heritage. I look forward to seeing the project grow and flourish in the years ahead.”
Ulster Wildlife is appealing for volunteers to help monitor the oysters as they settle into their new home. This involves conducting regular health checks to assess growth rates and surveying wildlife around the cages.
Training dates will take place on Wednesday 16th and 23rd of April – visit our volunteering section or email volunteering@ulsterwildlife.org to find out more.