It's well documented that the Canadians were concerned about Zander eventually finding their way into the Red River Basin and making their way north. Not only Canada but neighboring states were also concerned about the introduction of Zander. It's not known what affect the introduction of Zander would have on existing fisheries.
Odds of ever stocking more Zander are slim to none because the U.S. Fish and Wildlife Service announced a final rule on September 30, 2016, to add 11 nonnative freshwater species to the list of injurious wildlife under the Lacey Act: 10 fish (crucian carp, Eurasian minnow, Prussian carp, roach, stone moroko, Nile perch, Amur sleeper, European perch, zander, wels catfish) and 1 crayfish (common yabby). The rule went into effect on October 31, 2016.These 11 species are not in U.S. trade or are negligible in trade, so the listing results in only a minor, if any, effect on the U.S. economy. If introduced into the wild in the United States, the 11 species have the potential to become highly invasive and cause harm to freshwater habitats, native species, and the local economies these natural resources support. Therefore, the Service took this proactive step to keep these species out of the country. As a result of the injurious listing, importation and shipment between the continental United States, the District of Columbia, Hawaii, the Commonwealth of Puerto Rico, or any possession of the United States is prohibited, except as authorized by permit from the U.S. Fish and Wildlife Service for scientific, medical, educational, or zoological purposes.