By Peter Payette, Michigan Radio

Lake Superior is the largest freshwater lake in the world by surface area, and it has something the other Great Lakes don’t — stable populations of mostly native fish species.

But scientists say a key fish in Superior’s food web is now in trouble because of mild winters and an appetite for caviar in Europe.

http://michiganradio.org/post/what-european-demand-caviar-means-great-lakes-fish#stream/0