Thriving Loch Ryan oysters relocated to new Firth of Forth habitat

Oysters moved from Loch Ryan in south-west Scotland to the Firth of Forth are flourishing in their new environment. Since 2023, nearly 47,000 European flat oysters have been introduced across four different locations as part of the Restoration Forth initiative.

Dive teams from Heriot-Watt University monitoring the sites report an impressive average survival rate of around 88%. Dr Naomi Kennon of the university described the findings as "extremely encouraging."

Loch Ryan, located in Dumfries and Galloway, still hosts oyster populations celebrated through an annual festival, but overall numbers have significantly declined since the 19th century. Historically, oyster beds were common along Scotlands east coast, including the Firth of Forth and the River Dee, but WWF Scotland notes that there have been no verified sightings in the Forth since 1957.

Dr Kennon emphasized the positive impact of the project, highlighting the contributions of volunteers who prepared the oysters and teams who carefully placed them in the Forth. "One oyster grew 2.1cm in a single year, which is highly promising compared to the expected 1cm annual growth under favorable conditions," she said.

Oysters play a critical role in marine ecosystems, filtering water, storing carbon, and providing habitats for numerous species. While far from the historic abundance, the success of these relocated oysters underscores the importance of restoration efforts.

Caitlin Godfrey from the Marine Conservation Society expressed excitement at the high survival rates. She praised the dedication of volunteers, communities, and partners contributing to ocean recovery. "These oysters are not only survivingthey are thriving, laying the foundation for a healthier marine ecosystem and a brighter future for our seas," Godfrey stated.

The reintroduction of these rare oysters represents a significant step in reviving a species that helps maintain water quality and biodiversity in Scotlands coastal waters.

Author: Lucas Grant