Mussels and Byssus (IMAGE) University of Washington Caption Mussels anchor themselves to each other, rocks and other solid objects with byssal threads. Credit L Coutts/Friday Harbor Laboratories/UW Usage Restrictions Credit 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.