Culling is the process of sorting oysters by shape and size. If you intend to serve raw, shucked oysters, it is important to order only extra small or cocktail sized oysters. Pacific Oysters (Crassostrea gigas) in Canada have their own unique characteristics that set them apart from Atlantic Oysters (Crassostrea virginica) in terms of taste, texture, and appearance. The location of the oyster farm changes how they taste and look. Let’s dive a little deeper to check out the differences between every variety.