Scientists have achieved a breakthrough in marine conservation by successfully breeding wild oysters in the Dornoch Firth, north of Inverness. This marks the first time in the UK that wild oysters have reproduced at a site where they had been locally extinct for more than a century.
The baby oysters, described as having rough, cream-coloured shells and ragged edges, are about the size of a 50 pence piece. This natural reproduction is considered a significant milestone by Professor Bill Sanderson of Heriot-Watt University, who leads the Dornoch Environmental Enhancement Project (Deep).
Deep, launched 12 years ago, has deposited approximately 140,000 adult oysters into the firth. Conservationists hope that around 4 million native European flat oysters (Ostrea edulis) will soon colonise the restoration site. Historically, billions of native oysters formed extensive reefs around Britain, but they were fished to extinction across areas like the North Sea and the Channel during the Victorian era.
Oysters are known as ecosystem engineers, supporting diverse marine life, stabilising seabed sediments, and filtering water. Researchers anticipate that establishing an oyster reef could double seabed diversity over a decade. Warmer seas in the past two years reportedly aided the success of the project.