They are a very good walleye, smallie, sauger, pike, etc., bait!
I had wondered about this scenario in the past… obtaining bait from waters (mississippi river) known to be home to exotic species and selling them to the public. I know I can’t transport minnows used on the Mississippi River to another body of water for fear the water in the bucket might contain zebra mussels or other non-native nasty and this scenario would seem to me to be quite similar.
I do know that many of the willow cats sold by the baitshops in Winona are netted / dipped in N. MN. Would these ‘cats be exempted since they likely did not come from waters with exotic infestations?