Merroir is to oysters what terroir is to wine: it is the humus and natural environment which makes each product unique. There are 200 types of oysters but they all share a taste of umami and a brackishness that is more or less pronounced.
France is THE place for oyster farming, but it is also practiced on the Atlantic coasts of Canada and Argentina, as well as in California, Japan and Australia.
The oysters we eat belong to the family of Ostreidae, and are farmed in shallow waters, usually in colonies called beds, or rocks. Every oyster has a size and nuance of flavour depending on where it comes from.
In France, at Belon, Brest and Cancale, concave oysters come from Marennes and Oléron, while the finest oysters of all come from the region of Pitou Charente, where they are transferred from their oyster beds in the sea to clayey basins known as ‘claires’. Fine de Claire oysters, for example, with their strong curved shell, have a crisp iodised flavour with a plant-like aftertaste. The Fine de Bretagne is a classic with its layered shell and robust flavour. The Pousse en Claire oyster has a subtle taste that is round, sweet, mineral and long-lasting with a firm crisp flesh. Simple and delicate.
The Irish Ostra Regal oysters spend their first 24 months in the waters of Northern Ireland where they feed on phytoplankton. Then they are transferred to Southern Ireland for another 12 months at the mouth of the river Slaney, until sufficiently mature. The shell of this oyster resembles a drop of water and the mollusk itself is sweet, creamy and mineral-tasting.
How oysters are harvested
As described above, many of the oysters we eat are farmed. This method involves placing minuscule oysters, called oyster seeds, in large, basket-like structures called 'floats' in brackish water. As they grow, they are moved into different floats or beds until, after about 18 months, they are ready to be harvested.
But oysters can also be harvested from the wild. In shallow beds, oystermen use rakes to find suitable oysters. Others dredge the bed to collect many oysters in a basket, then sort them, returning those not yet ready for harvest.
Oyster harvesting and oyster habitats have spawned creativity: in different parts of the world, people have developed amphibious, shallow draft vehicles with both propellers and wheels to better traverse the changing tidal flats in search of oysters.
Let’s find out how to enjoy oysters at their best, both with other foods and wine.