About the size of a full grown goldfish if I remember well. Of course no additional photos available - if I had I would have put them here! (and I will not travel again to United States for it ) Thanks for the suggestion, I will check
It's almost certainly a Chubsucker, Erimyzon oblongus. The species occurs in creeks and lakes, and is named either Creek or Lake Chubsucker depending on where it was caught ! It is actually a Suckerfish of the Family Catostomidae.