Margaret & Clayton Lakes

September 2009

Fisheries Crews successfully completed rotenone treatments at Margaret and Clayton Lakes to remove nonnative trout and the hybridization threat they pose to native westslope cutthroat trout in the South Fork Flathead Drainage. Prior to treatment, possession limits were lifted from both lakes, allowing anglers increased harvest opportunities. Following ice out in the Spring of 2010, both lakes will be restocked with westslope cutthroat trout to reestablish the recreational fisheries. In addition to monitoring growth rates and spawning success of westslope cutthroat trout in these lakes, biologists are also interested in plankton, insect, and amphibian communities as well. These species are important indicators or aquatic ecosystem health and serve as the base for productive fisheries.

View photos of treatment of Margaret & Clayton Lakes: