Hydropower — DNA in a drop (IMAGE) DOE/Oak Ridge National Laboratory Caption : From left, ORNL’s Brenda Pracheil, Kristine Moody and Trent Jett collect water samples at Melton Hill Lake using a sophisticated instrument that collects DNA in the water to determine fish species and number of fish in the water, which could prove useful for monitoring hydropower impacts. Credit Carlos Jones/ORNL, U.S Dept. of Energy 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.