Tilapia-lettuce aquaculture system (IMAGE) Purdue University Caption Pilot-scale aquaculture system, incorporating tilapia and lettuce, being tested in a Purdue University greenhouse. Algae is used to clean the wastewater from the system. Credit Purdue Agricultural Communications/Tom Campbell Usage Restrictions News organizations may use this image in reports about the work of Purdue University’s Jen-Yi Huang, Halis Simsek and their colleagues. 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.