Assertion: rock oyster | /r/HasProperty | saccostrea glomerata
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Source sentences:
text: Pacific cupped oysters were first positively identified in the Auckland area of North Island, New Zealand in 1971 By 1977 Crassostrea gigas had become the dominant farmed oyster, having displaced the native Rock oyster ( Saccostrea glomerata ), through competition for settlement space and by virtue of their greatly superior growth rate.