<i>Daphnia magna</i> (IMAGE) University of Cologne Caption The planktonic crustacean Daphnia helps to decrease the micro-algae concentration in lakes. Credit Eric von Elert Usage Restrictions None 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.