Bull Trout (IMAGE) U.S. Geological Survey Caption This is a bull trout, a popular fish species of conservation concern, that find shelter in mountain stream climate refugia. Credit Bart Gamett, U.S. Forest Service 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.