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In this episode, Zeb Hogan continues his quest to find and protect the world's largest freshwater fish in the frigid rivers of Mongolia. He travels by plane, truck and horseback to find the largest salmonid, known as the Hucho taimen. This is not your everyday dinner trout. These monster fish can grow up to 6 feet in length, weigh up to 200 pounds and eat just about anything that crosses their path including muskrats, squirrels, smaller fish and sometimes even another taimen.