Zebra Mussels on Unio Mussel (IMAGE) University of Southern Denmark Caption This shows zebra mussels colonizing an unio mussel and preventing it from breathing and eating. Credit Vanessa Burmester 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.