Mesocosm Experiments (IMAGE) Umea University Caption To study growth of zooplankton, predators such as fish need to be excluded. In each lake enclosure (or mesocosm) studies were conducted for this purpose. Shown are (a) the running experiment, (b) mesocosm construction, and (c) mesocosm transport. Credit Anne Deininger Usage Restrictions Feel free to use this photo, but only in contexts related to this news release. Please give credit to the photographer. 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.