I knew immediately that something about this article was fishy. Mukwanago is a place in Wisconsin, the state of my birth.
During the 1940s, and when this industry began or ended I do not know, native carp were being harvested by seining from a small shallow lake near McFarland and shipped live in tanks to big cities (Chicago, most likely), where, I was told, a certain ethnic group deemed carp a highly desirable comestible item.