Arapaima

Arapaima, also known as pirarucu, can only stay underwater for 10 to 20 minutes at a time. They tend to stay near the water’s surface before coming up to breathe, using a modified swim bladder that opens into the fish’s mouth and acts as a lung. The noisy, distinctive gulp it makes sounds like a cough and can be heard from far away. Arapaima can reach more than 10 feet in length.