Coral Reef (IMAGE) University of California - Davis Caption Fish provide a critical service for coral reefs by eating algae that can kill coral and dominate reefs if left unchecked. Credit S.A. Hein Usage Restrictions Provide credit. 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.