Tunicates (image) The University of Bergen Caption Tunicates are marine filter feeders that weigh between 50 and 70 grams and are found in all oceans. Credit Inge Doskeland Usage Restrictions The image may only be used with appropriate credit. 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.