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Monster Fish of America

Dr. Zeb Hogan goes in search of North America's prehistoric river monsters: the white sturgeon. Many of the fish Zeb encounters on his trip are not only bigger than he is, but have lived the better part of a century. To find them, he'll travel to the Pacific Northwest and team up with scientists, divers, fishermen and a Native American tribe who are all trying to figure out why the white sturgeon is disappearing and whether dams may be putting these monster fish in danger.