Low Oxygen Content (IMAGE) Aarhus University Caption This image shows areas with low oxygen content (red) or no oxygen content (black) in the Baltic Sea in 1906 (A), 1955 (B) and 2012 (C), respectively. Credit Aarhus University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.