Mersea Island oysters are a type of oyster harvested from the waters surrounding Mersea Island, located off the coast of Essex, England. Known for their unique flavor, these oysters thrive in the estuarine environment, benefiting from the nutrient-rich waters of the Blackwater Estuary. These oysters are typically harvested from late summer to early spring, with peak season occurring in the winter months. They are celebrated for their plump, creamy texture and a distinct briny taste, making them a popular choice among seafood enthusiasts and chefs alike.