Britain's first organic shellfish will soon go on sale after winning the right to certification from the Soil Association.

Farmed mussels, oysters, scallops and clams from the Shetland Isles to Cornwall can all be recognised as organic by the SA after an organic standard was signed off by Defra last month.

"Given the benign nature of high-quality shellfish production, they're a natural fit with organic certification," said Hugh Raven, director of Soil Association Scotland.

It is a remarkable turnaround for the mussel, which was, until recently, on the Food Standards Agency's list of foods that are bad for the heart.

Well-known brands Loch Fyne Oysters and Blueshell Mussels have already said they'll be going organic. But some in the industry expressed concern over the move.

"Organic product is often merchandised by itself , which might affect sales," said David Gillies, chief exec of the Scottish Shellfish Marketing Group.