Monster Fish

Searching for some of the biggest freshwater fish in Brazil.

Zeb Hogan has a quest to save fish from extinction.

Aquatic ecologist Zeb Hogan continues his quest to find and protect the world's largest freshwater fish in the frigid rivers of Mongolia. He will travel by plane, truck, and horseback to find the largest trout known as the Hucho taimen.

Join fish biologist, conservationist and National Geographic Explorer Zeb Hogan to see the most extreme encounters in mega-fishing and the groundbreaking research being done to protect these fish.

As part of his Megafishes Project, Zeb Hogan heads to the Australian outback on an expedition to find the elusive sawfish, which looks like a cross between a shark, a stingray and a chainsaw and can grow to 22 feet long.

Zeb goes in search of one of North America's river monsters - the giant white sturgeon.