Four videos with facts about Mekong megafish species:
http://video.nationalgeographic.com/video/player/animals/fish-animals/bony-fish/giant-stingray-ani.html
http://video.nationalgeographic.com/video/player/animals/fish-animals/bony-fish/river-catfish-ani.html
http://video.nationalgeographic.com/video/player/animals/fish-animals/bony-fish/mekong-giant-catfish-ani.html
http://video.nationalgeographic.com/video/player/animals/fish-animals/bony-fish/chao-phraya-ani.html

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National Geographic has created a special site focusing on giant freshwater fish:
http://animals.nationalgeographic.com/animals/article/megafishes-index.html
Photo galleries, videos, and facts about several giant fish species. 

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AOL has posted an Associated Press story on the Megafishes Project and the giant freshwater stingray, Himantura chaophraya:
http://news.aol.com/article/scientist-seeks-biggest-freshwater-fish/90269

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