Eliminate the  lake trout entirely by destroying all fish life,then reintroduce the cutthrout.This would cost between 32 and 181 million.

I think that this would be the best idea because the cutthrout is prey to the lake trout,so if they were to not do anything  about it,then there would be no more cutthrout left.This would make a huge difference in the food chain.Also,the people who like to fish in yellowstone lake would not be able to anymore.Bears,eagles,and otters would all starve and die.Then there wouldn’t be much more of yellowstone to enjoy.