only superior has fish with humps, all the other great lakes the cohos just turn red to purplish, that is a bow, might have a broken bone somewhere who knows, maybe a disease, point is, its definently not a coho, this time of year the will be dark red to purple especially a male, his mouth will look like its on steroids, also youre missing the main factor determining wether or not its a coho, cohos have dark grey tails with no spots on them, similair to browns, bows have spots in these patterns/lines.