A keystone species of the Amazon River ecosystem, the arapaima is a powerful predator known by many names. Mike Bock Reaching up to 10 feet (3 meters) long and weighing 440 pounds (200 kilograms), ...

The 10-foot-long arapaima was quickly disappearing in Brazil until local communities stepped in to save it—and themselves. A close-up view of an arapaima from the Brazilian Amazon shows its unique ...

National Geographic Explorer João Campos-Silva has long been fascinated by the arapaima, since before it sprung back from near extinction just over a decade ago. The precarious state of the world’s ...

Two of Washington's biggest fish have died in recent days, it was announced Monday. And a third is ill, with an uncertain future. The fish that died are arapaimas, which were living and swimming in ...

The lack of tools for sex identification and assessment of gonadal development are hindering our ability to study the reproductive dysfunction of Arapaima gigas in captivity. This study initially ...