Jellyfish (IMAGE) National Oceanic and Atmospheric Administration Caption Some jellyfish pulsate to propel themselves through the water. Credit Courtesy of National Oceanic and Atmospheric Administration/Department of Commerce. Usage Restrictions Image credit to National Oceanic and Atmospheric Administration/Department of Commerce is required. 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.