Mekong giant catfish

Attaining an unconfirmed length of 3m (9+ft), the Mekong giant catfish grows extremely quickly, reaching a mass of 150 to 200kg in only six years. The largest catch recorded in Thailand since record-keeping began in 1981, was a female measuring 2.7 m (roughly 9ft) in length and weighing 293 kg(646 lb). This specimen, caught in 2005, is widely recognized as the largest freshwater fish ever caught.

click out these links:

http://en.wikipedia.org/wiki/Mekong_giant_catfish

http://news.nationalgeographic.com/news/2005/06/photogalleries/giantcatfish/

http://animals.nationalgeographic.com/animals/fish/mekong-giant-catfish.html