Whale Shark (Center) at the Okinawa Churaumi Aquarium (image) University of Tokyo Share Print E-Mail Caption Whale sharks, like this individual at the Okinawa Churaumi Aquarium, are the world's largest species of fish, growing to 10 to 12 meters in length. Despite their large size and threatened status, whale shark ecology remains mysterious. A University of Tokyo research team led by Alex Wyatt, a project researcher at the Atmosphere and Ocean Research Institute, created a blood test and tissue isotope analysis health check to better understand the animals. Credit Image by K. Sato, Okinawa Churashima Foundation Research Center CC-BY-NC-ND. Usage Restrictions Image by K. Sato, Okinawa Churashima Foundation Research Center CC-BY-NC-ND. Share Print E-Mail 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.