The Ocean Acidification Symposium was presented by the Centre for Chemical and Physical Oceanography, in November of 2012. The day-long symposium featured brief presentations from a wide range of researchers, of which this is one: Katie Baer Jones talks about the impact of Ocean Acidification on coralline algae and iconic shellfish such as Paua and oysters. Increases in the total dissolved inorganic carbon in the ocean lower the pH in the ocean, reducing the availability of carbonate ions for the making of shells.