Greenback Cutthroat Trout (IMAGE) University of Colorado at Boulder Caption A new University of Colorado at Boulder study has shown biologists trying to spur the recovery of the threatened greenback cutthroat trout in Colorado, have in many cases been restocking the wrong subspecies of trout into small streams and lakes in the state. Credit Colorado Division of Wildlife 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.