 In addition, this species was introduced to create an industry that was previously not available at all in that area.In addition to intentional introductions, the Pacific oyster has spread through accidental introductions either through larvae in ballast water or on the hulls of ships.In some places in the world, though, it is considered by biosecurity, primary industry, and conservation departments and ministries to be an invasive species, where it is outcompeting native species, such as the Olympia oyster in Puget Sound, Washington; the rock oyster, "Saccostrea commercialis", in the North Island of New Zealand; and the blue mussel, "Mytilus edulis", in the Wadden Sea.