The world's largest freshwater fish are losing the fight for survival, as pollution, overfishing, and construction threaten the rivers and lakes they call home.
So earlier this year ecologist Zeb Hogan launched the Megafishes Project, a three-year effort to document the 20-some species of freshwater fish at least 6.5 feet (2 meters) in length or 220 pounds (100 kilograms) in weight.
The project is designed not only to raise awareness of the animals' plight, but to highlight the increasingly dire situation of the world's water sources.
Join National Geographic News on the trail with Hogan as he tracks down and studies these real-life "Loch Ness monsters": leviathans such as the Mekong giant catfish, the giant freshwater stingray, the arapaima, and the Chinese paddlefish.
(The Megafishes project is funded by the National Geographic Society, which owns National Geographic News.)
 | Part One: Megafishes Project to Size Up Real "Loch Ness Monsters" (July 24, 2007) The three-year project aims to document the world's largest freshwater fishes, from giant catfish to half-ton stingrays. • Photo Gallery: Bear-Size Catfish, Half-Ton Stingrays Among World's "Monster" Fishes • Photo Gallery: 8-Foot Giant Catfish Caught in Cambodia |
 | Part Two: World's Largest River Fish Feared Extinct (July 26, 2007) Chinese paddlefish have not been seen in the Yangtze River since 2003 and are likely on the path to extinction, scientists warn. |
 | Part Three: "Living Fossil" Fish Making Last Stand in China (August 15, 2007) The half-ton fish are known as China's "pandas under the water," but they'll soon vanish from the wild unless a new breeding program can save it. |
 | Part Four: World's Largest Trout Thrives in Mongolia—For Now (November 14, 2007) For the ferocious, cannibalistic taimen, one of the world's biggest freshwater fishes, Mongolia's remote rivers are its last hope. • Photo Gallery: Taimen's Last Refuge Is Mongolia • Video: Biggest Trout Fished in Asia |
 | Part Five: World's Largest Shark Species at Risk, Expert Says (January 17, 2008) Whale sharks are coming under pressure from overfishing and habitat degradation, putting the world's biggest fish in urgent need of protection, says biologist Zeb Hogan. |
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