trout (IMAGE) The University of Montana Caption Westslope cutthroat trout and a bull trout swim in the Flathead River system of Montana. Credit Courtesy of Jonny Armstrong, USGS Usage Restrictions No restrictions. License Public Domain 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.