Zebra Mussels Clogging a Pipe (IMAGE) Cary Institute of Ecosystem Studies Caption This is an example of how biofoulers (in this case zebra mussels) can colonize pipes, obstructing flow. Credit Photo by Gemma Grace 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.