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Giants of Thailand

Biologist Zeb Hogan stands in Cheow Lan Lake holding a Mekong Giant Catfish, a fish whose weight he estimates to be 150 pounds. Thai government scientists stock these endangered giants, forcing fishermen to release two catfish for every one of these caught.

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Join Hogan on his quest to find and study the world's largest freshwater fish in Thailand waters. He'll travel the country in search of 600-pound Siamese carp, 10-foot-long Mekong giant catfish and the endangered giant freshwater stingray, among others. Then, he'll visit protected areas where the government has establish no-harvest zones, and meet a teenage entrepreneur who has become a top dealer of freshwater giants.