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Underwater Image Of A Giant Clam On A Coral Reef Taken At Sodwana Bay Kwazulu Natal South Africa Stock Photo 149270178Giant Clam,Human Lips,Bivalve,Clam,Color Image,Colour Mage,Day,Filter Feeder,Horizontal,Human Body Part,Jaw,Mantelpiece,Mollusk,Nature,No People,One Animal,Outdoors,Photography,Sea,Symbiotic Relationship,Tropical,Undersea,Underwater,Wildlife,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.