'Vampire of the Great Lakes' still haunts Lake Superior fish
October 31, 2017 - MPR’s Dan Kraker looks into the ongoing battle to control sea lamprey in the Great Lakes. It was one of the earliest aquatic nonnative species to invade the U.S., long before zebra mussels and Asian carp garnered headlines. Its also been one of the most destructive, wiping out lake trout populations.