Bleached coral (IMAGE) Florida State University Caption The coral reef at Moorea during the bleaching event in 2019. Most of the corals had turned white because they expelled the algae living in their tissues, a process known as bleaching. Credit (California State University, Northridge/Peter Edmunds) Usage Restrictions The image may only be used with appropriate caption or 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.