It looks like the biggest species of fish in a river is the aptly named Giant Mekong Catfish. They are native to China, Cambodia and Thailand. The Giant Mekong Catfish grow in the waters of the Mekong river which runs through all three countries. These freshwater fish can grow up to 10 feet in length and weigh up to 660 lbs. Currently, they are endangered and can only be caught with a special permit.
The biggest fresh-water fish is the Mekong Giant Catfish, found in Cambodia’s Mekong River Basin. The biggest fresh-water fish was previously known to be the Chinese Paddlefish, found in the Yangtze River in China, but it is now thought to be extinct since none have been spotted since 1995. Some people still believe the Chinese Paddlefish to exist, but since there has been no recent proof, the Mekong Giant Catfish is the official world’s biggest river fish. The biggest Mekong Catfish ever found was in May 2005 in Thailand, it was 9 feet long and weighed 646 pounds!
Upper Columbia Sturgeon weighs in at 600 Kilos and 6 meters, about double the Mekong Cat.
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