Coral Reef Island in the Maldives (IMAGE) University of Exeter Caption The study, based on work in the Maldives and published in the journal Geology, found that parrotfish produced more than 85 percent of the new sand-grade sediment on the reefs around these reef islands. Credit Chris Perry, University of Exeter 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.