fish

Ashley Hirtzel/WBFO

The Great Lakes Fishery Commission estimates that more than 40 million people in the U.S. and Canada depend on the Great Lakes for food, drinking water and recreation. A state-of-the-art research vessel, called the “Muskie,” is currently making its way through Lake Erie collecting data samples for the U.S. Geological Survey.

Mercury levels among fish caught in the Atlantic Ocean are dropping, but it's not the same case for fish from the Pacific Ocean.