World's Largest Freshwater Fish Threatened with Extinction

Around the world, freshwater "megafishes" face declining populations, increased threats from commercial fishing, shrinking habitats, and, in some cases, almost guaranteed extinction.

The "Megafishes Project" hopes to turn some of that around. The three-year project, sponsored by National Geographic and undertaken by University of Nevada, Reno researchers Zeb Hogan and Sudeep Chandra, aims to document and protect more than two-dozen giant fish species, many of which can weigh more than 200 pounds. The project was profiled in the June 22 issue of the journal Science (subscription required).

Species being studied by the Project include Thailand's Mekong giant catfish, China's paddlefish, and South America's Pirarucu. "Everywhere we look, the largest fish are disappearing," Hogan said in a University of Nevada press release. He says the world faces a "freshwater extinction crisis," and studying the world's largest fish can help benefit all other freshwater species.


Whlie in Lake Victoria, East Africa, it's the largest fish there (the Nile Perch) - that's driving the other species to extiction. Still, it's comforting to know some action is being taken to protect the fishes of the world.