One of the oldest and most bizarre-looking freshwater fish on the planet can be found in the American Midwest. That's where Dr. Zeb Hogan travels to find the paddlefish. It once teemed throughout the Mississippi and Missouri River systems, but its population has plummeted disappearing from four states and rapidly decreasing in others. Zeb teams up with biologists and conservation officers to better understand what's causing the decline of this American behemoth.
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