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       Since the early 1960's wild oysters have been harvested 
        from the sea by fishing vessels for round and half pearl production.  
      To produce a cultivated pearl, a "seeding" technician 
        operates on young oysters, implanting a 'mother-of-pearl' nucleus made 
        from fresh-water mussels.  
      Seeded/grafted wild oysters are contained in net panels 
        and held on ocean borne longlines, until it is time to harvest the cultivated 
        pearls. 
      Pearl oysters held inside panels are cleaned of biofouling, 
        using a cleaning machine to promote water circulation and thus the supply 
        of phytoplankton food to each oyster.  
      The pearl crop is harvested approximately 2 years later. 
       
        
       
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