"Invaders" in Great Lakes much more than just Asian Carp

For nearly two decades, The Environment Report and its predecessor The Great Lakes Radio Consortium have been reporting about invasive species on Michigan Radio. More and more kinds of pests are being introduced into the lakes, often by cargo ships bringing in critters from foreign ports. And it's a lot more than just Asian Carp, which has received plenty of headlines in recent years. 
William Rapai, the author of the forthcoming book Lake Invaders: Invasive Species and the Battle for the Future of the Great Lakes joins Stateside to discuss the challenges swimming around in our lakes.