Can’t speak for koi specifically but the silver carp infesting the Mississipi watershed are edible (they are a popular holiday dish in traditional Chinese cooking). The problem is, they are just too boney to for Western diners.
There are far to many governments in this world that would read this cartoon and say, “Please, Let us show you the exciting new thing we’re doing with education today.”
“Gad, I hate how head office makes us play musical chairs everytime they want to do a “reorganization of the company”!