“In the spring of 1989, tensions over Native American off-reservation spearfishing rights reached a boiling point in northern Wisconsin. Anti-spearfishing organizations encouraged the design and deployment of concrete walleye decoys like this one to disrupt off-reservation spearfishing. Such decoys were placed on lake beds where Ojibwe spearfishers would unknowingly strike them, damaging their spears.” (via Wisconsin Historical Society)