Chromis Fish and Staghorn Coral (IMAGE) Smithsonian Caption Blue-green chromis fish (Chromis viridis) and bicolor chromis fish (Chromis margaritifer) swim among staghorn coral in Palmyra Atoll National Wildlife Refuge in the tropical Pacific Ocean. (Credit: U.S. Fish and Wildlife Service) Credit U.S. Fish and Wildlife Service Usage Restrictions No restrictions. License Public Domain 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.