Pearl oysters are filter-feeding organisms that filter seawater and prey on plankton in the water. At the same time, the nutrients in the seawater are stored in the pearl oysters. Therefore, when they are cultivated properly and on a certain scale, they can purify the ocean.
An adult pearl oyster can filter about 250 liters of water every day. The harvest begins ten months to a year after the pearl nucleus is implanted. During this period of time, the pearl oyster has filtered more than 75,000 liters of seawater. A formally operating pearl farm has millions of pearl oysters. You can imagine that the amount of water it purifies is extremely huge!
Take Victoria Harbour as an example. It covers an area of 41.17 square kilometers and has an average water depth of 12 meters, which means it has 500 million cubic meters (tons) of seawater. This seems like an amazing amount of water, but it only takes 6 million pearl oysters to filter Victoria Harbour once a year.
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