After more than a year of careful rearing, thousands of juvenile native oysters have now been returned to the Milford Haven Waterway, marking a major milestone in an ambitious restoration project involving the Pembrokeshire Coast National Park Authority.

Since the project began in late 2023, Bangor University’s School of Ocean Sciences has been nurturing native oyster broodstock collected from Angle Bay and Burton Ferry. These oysters spawned multiple times in controlled conditions, producing hundreds of thousands of larvae. The tiny larvae were then reared until they were ready to settle on to shells, where they mostly remain fixed as they grow. Some scallop shells held as many as 160 individual oyster spat, ranging from 4mm to 10mm in size.

In February, an estimated 200,000 baby oysters were released into the Waterway by students from Paddle West. The team (assisted by Sky the dog, and with rescue cover support from Rudders Boatyard) successfully transported the oysters to their deployment site in shallow water where they were laid by hand.

Once abundant in UK waters, native oyster populations have dramatically declined due to habitat loss, pollution, over-harvesting and disease.