Apr 29, 2004 — For centuries, the American eel dominated the waters of Lake Ontario and the St. Lawrence River. Only 50 years ago, the snake-like fish accounted for half of the biomass of Lake Ontario. Today it has all but disappeared. Researchers and fishermen see the decline as a shrill warning about changes in climate and the environment. And they say now is the time to do something about it. David Sommerstein reports.