You could be right Hookjaw. But lets not forget about the lethal Green Sun fish
Im sure we’ll find out soon enough what it is and why all of the fish up there are dying.
Maybe just give it a new name as a new species, alien-planted or not, in Utah:
Mother-in-Law fish!
After closer examination its clearly a Tooth Carp [sly]
You know the Brigham area! 
it could be any cross Breed 
, Do a DNA test, and I think there is more knowledge here on BFT, than the DWR has, O-well makes for an interesting talk.