In the 1970s a few West Coast hatcheries started raising and marketing them as the new summer oyster replacing the Pacific Oyster (Crassostrea gigas), which isn’t as palatable during the summer months. The Chinese River Oyster is native to Japan, China, India, and Pakistan. In some places in the world, though, it is considered by to be an invasive species, where it is outcompeting native species, such as the Olympia Oyster, Ostrea conchaphila, in Puget Sound, Washington, the rock oyster, Saccostrea glomerata in the North Island of New Zealand and the blue mussel, Mytilus edulis, in the Wadden Sea. As well as intentional introductions, the Pacific oyster has spread through accidental introductions either through larvae in ballast water or on the hulls of ships. In addition, this species was introduced to create an industry that was previously not available at all in that area. In most places, the Pacific oyster was introduced to replace the native oyster stocks which were seriously dwindling due to overfishing or disease. The most significant introductions were to the Pacific Coast of the United States in the 1920s and to France in 1966. It is now the most widely farmed and commercially important oyster in the world, as it is very easy to grow, environmentally tolerant and is easily spread from one area to another. It originated from Japan, where it has been cultured for hundreds of years. Crassostrea gigas or Pacific or Japanese oysterĬrassostrea gigas, Japanese Oyster, or Pacific Oyster was named by a Swedish naturalist, Carl Peter Thunberg in 1795.
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