Micro Fishing for Something New

Traveled to south central Idaho to see if I could catch some Lahontan Cutthroat Trout in the Grasmere Reservoir. The water was murky, the weather was hot and dry, and the fishing was difficult. I was seeing some small fish surfacing around the water's edges and decided to see if I could catch one of them to see what they were. What species of fish is this? Mountain Whitefish?