Billions of baby oysters

The first signs of a bumper new generation of wild native oysters have been found in Loch Ryan, Stranraer, following an unusually large spawning event in the loch this summer. Young oysters have settled on specially prepared collectors laid on the seabed in June, and the fishery that manages Scotland's last wild native oyster bed says the results of the first checks of the collectors, which took place earlier this week, are very positive. 

The news comes days before Stranraer Oyster Festival opens on the shores of the loch on Friday 11 September, with Loch Ryan natives on the menu and the biggest line-up of celebrity chefs the community-run festival has ever hosted.

Loch Ryan is one of Europe's most important native oyster beds, with oysters from the loch supporting restoration projects around the UK as well as supplying some of the country's top restaurants. The bed is managed on conservation principles, with around 95% of each catch returned to the loch to encourage the oyster bed to grow. 

In June, when the fishery team were installing spat (baby oyster) collectors, they found that around 30% of the oysters they sampled were brooding larvae at the same time, their flesh turned a milky grey by the tiny larvae each one was carrying. 

Loch Ryan's bed is home to an estimated 23 million native oysters, according to a stock assessment carried out by Professor Bill Sanderson of Heriot-Watt University for the Solway Coast and Marine Project. A third of that population is roughly seven million oysters, and each native oyster carries around a million larvae. Around 10 June, when they released those larvae into the loch, it is estimated that trillions of baby oysters entered the water within a few days of each other.

Tristan Hugh-Jones, Director of Loch Ryan Oyster Fishery Company, said: 

"A native oyster only carries its larvae for around three days before releasing them into the sea, so to find a third of the sample brooding at exactly the same moment leapt out at us. We have simply never seen this proportion of Loch Ryan oysters spawning simultaneously in such numbers before. When so many are breeding together, the larvae have far more opportunity to be fertilised and to settle, and that gives us real hope of a good spatfall."

Native oyster larvae swim freely for around ten days before settling on the seabed and fixing themselves to a hard surface, ideally shell. Whether a spawning becomes the next generation of Loch Ryan native oysters depends entirely on where, and whether, the larvae settle. Loch Ryan's geography is particularly well suited to native oysters, as the sheltered waters of the sea loch retain a large proportion of the larvae rather than letting them drift out to sea. 

To find out where this year's larvae were landing, the fishery placed collectors at various locations around the loch. The collectors included coupelles, stacked plastic plates used by oyster farmers, and concrete blocks coated in lime and laid directly on the seabed. The lime coating creates the closest thing to an artificial shell surface for larvae to attach to. It also makes the young oysters far easier to see and count. The collectors were checked earlier this week, and it was found the blocks on the seabed did the best job, with hundreds of young oysters settled on the lime-coated surfaces. 

Tristan believes the marine heatwave reported around the UK earlier this year is the likely driver of the early spawning. He said: "Native oysters need to settle on a firm, shelly surface, and the lime gives them exactly that. Taken together with what we saw in June, the bed this summer looks to be in the healthiest state it has been for a very long time."

From the loch to the festival

Tristan added: 

“People sometimes assume conservation and fishing pull in opposite directions, but in Loch Ryan they're the same thing. The oysters we sell are what allow us to manage the bed in the way we do, returning 95% of what we catch and monitoring the population. Nobody would be doing any of that if there wasn’t a market for the oysters, so when someone eats a Loch Ryan native at Stranraer Oyster Festival, they’re directly contributing to the work that keeps this oyster bed healthy.”

The festival's Speakers' Marquee this year hosts an engaging programme of free events including marine scientists from Heriot-Watt University and the Roslin Institute, and the Solway Coast and Marine Project (SCAMP) streaming live pictures from a remotely operated vehicle on the bed of the loch on both Saturday and Sunday. Wellbeing is to the fore too, with free fusilates, guided meditation and paddleboarding sessions on the shore giving visitors a chance to slow down between the oysters.

The chef demo line-up is the strongest in the festival's history, with every celebrity chef who attended in 2025 choosing to return. Saturday Kitchen's Matt Tebbutt, Rosemary Shrager, Tony Singh and Julie Lin will all be cooking live with the people, place and produce of Galloway. Demand has been so high that additional Saturday demonstrations have been added for Rosemary Shrager and Tony Singh after their first events sold out. Sunday brings A Taste of Galloway, in which Rosemary Shrager and Julie Lin cook with some of the region's finest produce, from Loch Ryan venison and Walled Garden Honey Co honey to Galloway cheese from headline sponsor Lactalis and a dram from Galloway Distillery, before Matt Tebbutt and Julie Lin close the weekend's cooking with a Celebrity Cook-Off.

Beyond the marquees, the festival opens on Friday evening with a piped opening ceremony and fireworks over the harbour and runs through the weekend with an extended main marquee hosting more local food and drink producers than ever, an artisan market, a full children's programme, and live music across all three days.

Romano Petrucci, Chair of Stranraer Development Trust, the community organisation that runs the festival, said: "When we started this festival, most people had no idea what was under the water in Loch Ryan. Now the loch's oysters are recognised right across Europe as an ecological treasure. To hear in the very week we open the festival gates that the bed is thriving and the next generation is already settling, well, that's the best news we could have hoped for. Every oyster enjoyed at the festival helps look after that bed, so you can eat with a clear conscience and a big smile.

"This festival is put together by the community, and that's what gives it its heart. Every one of our celebrity chefs wanted to come back this year, and I think that tells you everything about the welcome this town gives. Stranraer is proud of its oysters, proud of its festival and proud of the community spirit that makes it all happen, and we want the whole of Scotland and beyond to come and celebrate with us. The weather might be in the hands of the gods, but my goodness, what a weekend we've got ahead."

Stranraer Oyster Festival 2026 is supported by headline sponsor Lactalis UK & Ireland, alongside Rock Island whisky from Douglas Laing, Stranraer Skills Station and the Loch Ryan Oyster Fishery Company. The festival is supported by Dumfries and Galloway Council's Signature Events programme, and the work of Stranraer Development Trust is also supported by South of Scotland Enterprise.

Stranraer Oyster Festival runs from Friday 11 to Sunday 13 September 2026 on Stranraer’s waterfront, from Friday 5.30pm until late, Saturday 10.30am until late, and Sunday 10.30am to 6.30pm. Day tickets are £8–£12, weekend tickets £26–£32, and a free festival shuttle bus runs throughout. Children attend free of charge. Kitchen Marquee chef events are ticketed separately, with Speakers' Marquee talks free.