“Fitbit” for Fish (IMAGE) DOE/Pacific Northwest National Laboratory Caption Lab-on-a-Fish uses multiple sensors to wirelessly track location, heartbeat, tail movement, and even temperature of the surrounding environment. Credit Graphic by Michael Perkins | Pacific Northwest National Laboratory Usage Restrictions None 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.