How did Salmon get in Lake Michigan?

This ARTICLE from a couple of years ago explains how Lake Michigan's world class salmon fishing got started. We can't wait to see what 2015 brings in terms of size and numbers of King and Coho Salmon. It should be another great year! 

http://www.mlive.com/outdoors/index.ssf/2011/04/the_salmon_experiment_the_inve.html