I caught a fish in a lake and I think it's a bass, what kind is it?

So I caught this fish and I think it's a bass. It was fairly small and fat. It was green, had a white belly, yellow fins, and turquoise swirls around it's gills and mouth. It's mouth sort of folded out like a suction cup, just like most bass that I've seen. Could it be a perch? What kind of fish is it do you think? (PS I caught it in a little lake in Colorado, near the Rocky Mountains).