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Crassostrea gigas is an important aquaculture species throughout the world. It has a white elongated shell, with an average size of 150-200 mm. C. gigas will attach to almost any hard surface in sheltered waters. Whilst they usually attach to rocks, the oysters can also be found in muddy or sandy areas. C. gigas settles in dense aggregations in the intertidal zone, resulting in the limitation of food and space available for other intertidal species. In Australia, the Pacific oyster was deliberately introduced into Tasmania, Victoria, WA and South Australia, and has spread to New South Wales and southern Queensland.

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