Nonnative Lake Trout (IMAGE) The University of Montana Caption Vin D’Angelo, a USGS fisheries biologist, holds up a nonnative lake trout that was caught recently in Glacier National Park’s Logging Lake. Credit Photo courtesy Joe Giersch, 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.