Greenback Cutthroat Trout (IMAGE) University of Colorado at Boulder Caption CU-Boulder professor Andrew Martin and Senior Research Associate Jessica Metcalf release endangered greenback cutthroat trout into Zimmerman Lake west of Fort Collins, Colo. on Aug 8. Their research identifying the 'true' greenback cutthroat trout native only to the South Platte River basin has spurred a new recovery effort involving state and federal wildlife agencies to bring Colorado's official state fish back home to its historical haunts. Credit Photo by Glenn Asakawa/University of Colorado 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.