Electric rays for mapping ocean terrain (IMAGE) RIKEN Caption Researchers fixed acoustic transmitters to electric rays and sting rays and were able to map their movements as they swam close to the ocean floor. Credit RIKEN Usage Restrictions credit RIKEN 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.