Rainbow Trout (IMAGE) ARC Centre of Excellence for Coral Reef Studies Caption Fish are far more effective at delivering oxygen throughout their body than almost any other animal. Credit Ilan Ruhr Usage Restrictions For use only in association with this media story. Must carry image 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.