Catching water samples with a CTD (IMAGE) University of Oldenburg Caption At sea (here with the research vessel Heincke in the North Sea), the team collects water samples containing environmental DNA. Credit HIFMB|Kingsly Chuo Beng Usage Restrictions Use only in connection with article and with appropriate 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.