The Amazon River, a labyrinth of winding waterways cutting through the heart of South America, is home to a dazzling array of ...

MAMIRAUÁ RESERVE, Brazil — On this stretch of the Amazon River, you don't need a fish finder to locate the pirarucu, one of the world's largest freshwater fish. The splashing gives them away.

Reaching up to 10 feet (3 meters) long and weighing 440 pounds (200 kilograms), arapaima are the largest freshwater fish in South America—and an important species in the Amazon River ecosystem.

Other possible contenders for biggest fish included the air-breathing arapaima, which dwells in South America’s Amazon Basin, and the wels catfish, Europe’s largest freshwater fish and a ...

The pirarucu, the giant fish of the Amazon, was an endangered species. Due to conservation efforts, it's making a comeback. Now a big fish story - seriously. In the Amazon jungle, there is a ...

Behind the Amazon, the next-longest river is the Yangtze River, which is only about 85 miles shorter than the Amazon. 4. It Affects Sea Level in the Caribbean Sea ...

The world’s largest river is parched. The Amazon River, battered by back-to-back droughts fueled by climate change, is drying up, with some stretches of the mighty waterway dwindling to shallow ...

Organic matter binds to metal pollution. The rich organic matter that gives the largest tributary of the Amazon River, the Rio Negro, its characteristic black hue may provide fish with some ...

Why we still haven’t caught the world’s largest fish. Nat Geo Explorer Zeb Hogan has spent decades asking the question. “I thought there would be a simple answer,” he now concedes, after ...