pirarucu, (Arapaima gigas), also called arapaima or paiche, ancient, air-breathing, giant fish of Amazonian rivers and lakes. ... The pirarucu's air bladder allows the fish to breathe air. Only very young pirarucu have functional gills.

Does arapaima breathe air?

The arapaima is a massive yet sleek, streamlined freshwater fish native to the streams of the Amazon River basin. It can breathe air, allowing it to survive in pools with low water levels or decaying vegetation.

How long can arapaima hold their breath?

As obligate air breathers, arapaimas can only stay underwater for 10 to 20 minutes. 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.