Oyster Farm

Croatia's best-known oysters all come from one stretch of water: Mali Ston Bay, the long, narrow inlet trapped between the Peljesac peninsula and the mainland north of Dubrovnik. It is neither large nor busy, but it produces a shellfish carrying an EU protected-origin label and a reputation that reaches back to antiquity. Add the medieval walls of Ston and the salt pans they were built to defend, and the head of the bay becomes one of the more rewarding short stops anywhere on the southern Dalmatian coast.

A Bay Built for Shellfish

The bay runs about 21 kilometres inland from its mouth to the isthmus at Ston, is at most 2.2 kilometres across, and stays shallow the whole way, with depths of roughly 7 to 28 metres. Its character comes from the mixing of waters: abundant submarine freshwater springs rise through the karst seabed, and the nearby Neretva river adds its own outflow depending on season and current. The result is brackish, naturally nutrient-rich water, mildly eutrophic in the technical description, which is precisely what the European flat oyster, Ostrea edulis, needs to fatten.

That combination has made this the largest oyster-growing area in the Adriatic. It is also protected: the bay was declared a Special Nature Reserve in 1983, covering 4,821 hectares from the Sreser-Duba line eastwards, which limits development along the shore and keeps the water clean enough for a species notoriously intolerant of pollution. Written sources record oysters being eaten at Narona, the Roman settlement near the Neretva delta, so people have been harvesting here for the better part of two thousand years.

From Roman Tables to the EU Register

Trade in Mali Ston oysters is documented from the 16th century, and by 1667 there is a record of an actual farm using wooden structures for cultivation; concessions and collection rights appear in writing through the seventeenth and eighteenth centuries. During the long life of the Republic of Ragusa, which bought Peljesac and Ston in 1333, the oysters were a fixture at the nobility's table and a standard gift for visiting diplomats.

The habit outlasted the republic. Emperor Franz Josef of Austria had them sent north to Vienna packed in wooden crates, and local storytelling insists Casanova once got through fifty of them at breakfast, which is best taken with a grain of salt. More verifiable: Mali Ston oysters took a Grand Prix and gold medal at the 1936 London World Exposition, and the first public shellfish company was established in Bistrina Bay in 1946. The modern seal of approval arrived in 2020, when the European Commission entered the Mali Ston oyster, malostonska kamenica, in the EU register as a Protected Designation of Origin, one of a short list of Croatian foods to hold that status.

How the Oysters Are Grown

Farming here still begins in the wild. Growers collect natural spat, cement the young oysters onto ropes and suspend them from floating structures, a technique used in this exact form nowhere else. Mussels, Mytilus galloprovincialis, are farmed alongside them on nylon sockets. The oysters take roughly three years to reach harvest size, and only mature shellfish are lifted.

The main grounds are the sheltered bays of Bistrina and Kuti, with cultivation having spread outward towards Malo More; boats run out to the beds from Mali Ston and from the village of Hodilje. Production has fallen a long way from its peak. In the late 1980s the bay yielded something like 1.5 million oysters and two to three thousand tonnes of mussels a year, while more recent figures are closer to 500,000 oysters and around a thousand tonnes of mussels. About forty farmers hold legal concessions.

Timing matters if you are eating rather than counting. The oysters are considered at their best in March, around St Joseph's Day on the 19th, which is when Mali Ston holds its oyster festival: a few days of shucking, local white wine and a great deal of noise in a village of a few dozen houses.

The Walls and the Salt Pans of Ston

The reason a place this small has a fortification system this big is salt. Ston's salt pans are the oldest still-working saltworks in Europe, and their revenue, some 15,900 ducats a year at their height, was a serious line in the Ragusan budget. The layout you see today dates from the Dubrovnik Republic period: 58 shallow evaporation pools feeding nine crystallisation basins, all but one named after a saint, still worked by hand through the summer and still producing around 500 tonnes of sea salt a year.

To protect that asset, Dubrovnik began building in 1358 and kept going until the end of the 15th century, with Michelozzo, Juraj Dalmatinac and Bernardino Gatti among the architects involved. The complete system once ran more than 7 kilometres, linking Ston on the south side of the isthmus with Mali Ston on the north. About 5.5 kilometres survive today, along with 20 of the original 40 towers and five forts, including the Veliki kastio at Ston and the crown-shaped Koruna above Mali Ston. Roughly half a kilometre was brought down by the 1667 earthquake, more was lost to nineteenth-century quarrying, and further damage came in 1979 and 1996; restoration resumed in 2004 and the walls reopened to walkers in 2009.

The circuit around Ston takes about twenty minutes on foot, the full traverse to Mali Ston closer to forty, and the ridge gives you the salt pans on one side and the oyster rafts on the other. Between the shellfish, the walls and the salt, this corner of Peljesac is worth a visit if you're chartering a gulet in Croatia, particularly if lunch involves something that came out of the bay an hour earlier.