In this photo released by World Wildlife Fund-National Geographic, two Thai fishermen show a 293-kilogram (646-pound) giant catfish they caught from the Mekong River in Chiang Khong district of Chiang Rai province, northern Thailand Saturday, June 11, 2005. Thai fishermen have caught this giant catfish believed to be the world’s heaviest living freshwater fish but died and was eaten after environmentalists and officials negotiated for its release to allow it to spawn. (AP Photo/Suthep Kritsanavarin, HO)