Measuring 10 feet long and weighing in at more than 400 pounds, it's hard to imagine that the arapaima, the largest fish in the Amazon River basin, could ever go missing.

Scientists who studied why the scales of a huge Amazonian fish, which lives piranha-infested waters, are some of the toughest in the world hope their work could help to create armor. The outer ...

Ten Fascinating Facts About the Arapaima, the Largest Freshwater Fish in South America This keystone species of the Amazon River ecosystem are a fearsome predator with many names.

A colossal freshwater fish that can reach up to 10 feet in length has mysteriously washed up on a shoreline in Florida. The arapaima is … ...

The natural body armor of the South American arapaima fish is so tough that it can withstand the piercingly fierce bite of a piranha without a problem.

The surprising answer -- given the notorious guillotine-like bite of the piranha -- is Brazil's massive Arapaima fish. The secret to Arapaima 's success lie in its intricately detailed scales ...

Piranha teeth were attached to the top "punch," which was pressed down into Arapaima scales embedded in a soft rubber surface (which mimics the soft underlying muscle on the fish) on the lower ...

Despite arapaima’s role in indigenous life, scientists know little about them. DeSouza is working to change that by discovering the giant fish’s migration routes.

The piranha-bite-proof scales of the Arapaima fish could serve as the inspiration for body armor that is tough yet flexible.

The arapaima is a 400-pound air-breathing fish that can grow up to 10 feet long; experts say it's not too late to save it ...