Tunicates (IMAGE) Virginia Institute of Marine Science Caption VIMS scientist Lisa Kellogg is studying how tunicates, shown here growing atop an oyster shell covered with mussels, contribute to reef filtration. Credit Lisa Kellogg/VIMS. Usage Restrictions One-time use only. 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.