“Eel Threat” — The Discovery Files

Researchers from Michigan State University, the University of Minnesota and Western Michigan University have homed in on a fatty molecule that directs the destructive migration of sea lampreys — a type of eel — and the results of their study could lead to better ways to control them. One sea lamprey can kill more than 40 pounds of fish, and the U.S. and Canadian governments spend approximately $20 million annually to control them in the Great Lakes.