trout feed heavily on salmon eggs and fry, as well as fish. Conservation The bull trout is listed as a threatened species under the U.S. Endangered Species Act throughout its range in the contiguous United States. It is used as a management indicator species for several national forests, including Boise National Forest and Sawtooth National Forest (Sawtooth National Recreation Area). They can also be found in the Glacier National Park. Bull trout reproduction requires cold water and very low amounts of silt, both of which are negatively impacted by road building and logging. Additionally, its need to migrate throughout river systems may be hindered by impassible fish barriers, such as dams. Bull trout populations are also in danger from hybridization with non-native brook trout. Several of these issues were raised in a long-running lawsuit where in 2003, the Oregon Natural Desert Association and the Center for Biological Diversity sued the U.S. Forest Service claiming they violated the National Forest Management Act and Wild and Scenic Rivers Act by approving grazing plans in Oregon's Malheur National Forest. In April, 2018, U.S. District Judge Michael W. Mosman dismissed the complaint. They are a prized game fish in northern Canada. It was once maligned out of fear they threatened populations of other native species more prized by anglers. Some jurisdictions publicize the requirement to release with the slogan "No black, put it back". Historical names "Dolly Varden" in California Historically, confusion has existed between S. confluentus and Salvelinus malma malma, today commonly called the Dolly Varden trout. This was likely due to overlapping ranges and similar appearances among members of the two species. The first recorded use of the name "Dolly Varden" for a fish species was applied to members of S. confluentus caught in the McCloud River in northern California in the early 1870s. In his book Inland Fishes of California, Peter Moyle recounted a letter from Mrs. Valerie Masson Gomez: In 1874, Livingston Stone, a naturalist working for the U.S. government, wrote of this fish: It is currently unknown whether the name "Dolly Varden" was later applied to S. m. malma because of its similar appearance to S. confluentus; the two may have even been believed to be the same species. The name "Dolly Varden" may have also been given to S. m. malma independent of the McCloud River fish. Ironically, the original "Dolly Varden" trout (i.e., S. confluentus) apparently likely