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 ...

A giant arapaima feeding turns into a daring challenge as participants hold pieces of fish in their mouths and lower them toward the water. The fish rises to take the food while everyone watches how ...

For almost four hours, a camera watched a dense wall of juvenile arapaima moving through an indoor tank. Then the surface broke. Scores of fish rose, exchanged air and dropped back into the shoal ...