Invertebrate
Sydney Rock Oyster
Saccostrea glomerataAlso known as Rock Oyster, Auckland Oyster, New Zealand Rock Oyster
Sydney rock oysters thrive in the intertidal zones of Australia's eastern coast, cementing themselves to rocks, mangroves, and jetty pilings. These bivalves act as critical ecosystem engineers, filtering massive volumes of water and creating complex reef habitats that shelter juvenile fish and crabs. Their shells grow in highly irregular, fluted shapes, adapting perfectly to the contours of their chosen hard surface.
Filter FeederMarineReef Builder
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—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Diet & preyPhytoplankton, Microalgae, Organic Detritus
Predators
- Mud Crabs
- Pied Oystercatchers
- Stingrays
ThreatsWater pollution, ocean acidification, habitat loss, and mud worm infestations
HabitatsEstuaries, intertidal rocky shores, and mangrove forests
Life spanUp to 10 years
Classification
- FamilyOstreidae
- SpeciesSaccostrea glomerata
Range data is not available yet.
Interaction riskLow
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- Moderate
- High
- Very high
- Why interaction risk is low
- Sharp shell edges can cause deep cuts; wear sturdy footwear when exploring rocky intertidal zones.
Responsible observation
- Watch your step: Walk carefully on rocky shores as the shells are razor-sharp and easily slice through soft footwear.
- Observe water filtration: Look for slightly open shells in shallow water to see their mantle edges actively pumping.
Competitor Unknown / CC-BY · cc-by
Predator "Mud Crab" by darkday. is licensed under CC BY 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by/2.0/. · cc-by
Predator (c) Kym Nicolson, some rights reserved (CC BY) · cc-by
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