Empty blue mussel shells washed up (IMAGE) University of Gothenburg Caption Empty blue mussel shells washed up after the death of large numbers at a depth of 1-5 meters at northern Orust in 2007. Credit Photographer: Inger Forsberg. Usage Restrictions No restrictions. License Public Domain 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.