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Underwater Image Of A Giant Clam On A Coral Reef Taken At Sodwana Bay Kwazulu Natal South Africa Stock PhotoAnimal Wildlife,Bivalve,Clam,Color Image,Day,Filter Feeder,Giant Clam,Horizontal,Human Body Part,Human Lips,Mantelpiece,Mollusk,Nature,No People,One Animal,Outdoors,Photography,Sea,Symbiotic Relationship,Undersea,Underwater,ZooxanthellaePhotographer Cormac McCreeshCollection: Gallo Images The giant clam is a bivalve mollusc that filters food particles from the water to feed. The soft lining of the clam's shell contains symbiotic zooxanthellae. These are photosynthetic algae that produce oxygen for the clam and feed on food scraps and the clam's waste. They also produce the colour.