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Giant Catfish

Photo: Giant catfish on a boat
One of the largest fish in the world, Mekong giant catfish, such as this one on a fisherman's boat, can reach 10 feet (3 meters) long and weigh up to 650 pounds (300 kilograms). This critically endangered species has suffered from overfishing, dam building, and habitat destruction.
Photograph courtesy Zeb Hogan

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