The world's largest omnivore is a fish (IMAGE) Australian Institute of Marine Science Caption Researchers were surprised to discover whale sharks ate seaweed as well as krill at Ningaloo Reef, Western Australia. Credit Photo by Andre Rerekura, Australian Institute of Marine Science Usage Restrictions please credit image License Original 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.