Hong Kong was a major port of oyster harvest for China from the Qing Dynasty, and has records of harvest from at least 700 years ago. It was a major exporter of lime, produced from burning the shells in kilns, and oyster meat. This meant that the oyster reefs in Hong Kong were harvested to the point that they are now almost non-existent as a habitat, completely changing the shores of Hong Kong without intervention and restoration. We are working the the Nature Conservancy to restore oyster reefs in Hong Kong.
From our research with TNC we have calculated that 7 m2 of Hong Kong oysters can filter an Olympic swimming pool per day.
Water filtration at 15 °C over a tme lapse of 40 minutes
Water filtration at 30 °C over a time lapse of 30 minutes