Laboratory analyses for fish tissue samples from Lake Koocanusa and Kootenai River Basin, Montana, 2022 (ver. 2.0, May 2025)

This data release includes laboratory analyses for fish tissue samples collected from Lake Koocanusa and the Kootenai River Basin in Montana during 2022. Samples were collected by the U.S. Geological Survey (USGS) Wyoming-Montana Water Science Center (WY-MT WSC) in cooperation with Montana Fish, Wildlife and Parks (MT FWP) and Montana Department of Environmental Quality (MT DEQ). Analyses include histology, percent moisture, carbon and nitrogen stable isotopes, and concentrations for 62 elements, including selenium, mercury, and methylmercury. This data release also compiles laboratory quality-assurance and quality-control data associated with the samples.