Quagga mussel (IMAGE) UK Centre for Ecology & Hydrology Caption Quagga mussels can spread rapidly, outcompeting native mussels, and block water pipes. Credit JN Stuart Usage Restrictions Credit License Original 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.