Thousands of native oysters released into the North Sea are thriving off the North East coast, offering fresh hope for cleaner water and richer marine life around Britain.
About 1,000 mature oysters and 15,000 juveniles, known as spat on shells, have been placed at a nursery off South Tyneside as part of a six-year conservation project.
Oysters create reefs for marine life
The work is being led by the Zoological Society of London (ZSL) and Groundwork North East and Cumbria, which have been developing self-sustaining oyster reefs in Sunderland and off the Whitburn coast.
The nursery sits 1.5km (one mile) offshore and covers an area of seabed roughly the size of one and a half football pitches. The latest releases are among the final stages of the project.
ZSL project manager Celine Gamble said the oysters were “currently thriving” and that the team hoped to see the biodiversity benefits they could bring.
Oyster reef cubes containing 4,000 oysters were released off Whitburn in October 2025. The cubes, made using six tonnes of a robust, seawater-resistant and carbon-neutral alternative to concrete, act as ballast to secure the oysters to the seabed.
Natural water filters
Native oyster numbers in the UK have fallen by 95% since the 1800s, with habitat changes, over-harvesting, pollution and disease all contributing to the decline.
Restoring them could bring practical benefits for coastal waters. Marine ecology lead Ashleigh Tinlin-Mackenzie said each oyster can filter 200 litres of water, while the reefs provide shelter for other species.
Divers visiting the site have already found signs of a developing underwater community. Dan McMullen, from Project Baseline UK, said the reefs were attracting velvet swimming crabs, brown crabs, lobsters and juvenile fish.
“They’ve created a habitat for many juvenile fish,” he said.
Monitoring continues
The project has entered its final year of funding through the Stronger Shores Partnership, led by South Tyneside Council with support from the Environment Department.
The oyster nurseries at Sunderland Marina and off Whitburn will continue to be monitored, with the project team working to maximise the oysters’ chances of survival and help restore a species that once fringed coastlines across the UK.
