Arapaima gigas
giant arapaima

Arapaima gigas exclusively inhabits the Amazon River Basin of South America.

(Goulding et al., 1993)

Within the Amazon basin, A. gigas is found in several different types of habitat, such as the floodplain lakes of this region, the large tributaries of the Amazon river including the Rio Madera and the Rio Machado, and the varzea or forest. The pirarucu inhabits both white water and clear water. Much of the water that comprises the pirarucu's habitat is also oxygen deficient, as it is located in swampy areas of the rainforest.

(Lowe-McConnell, 1987; Goulding, 1980)

The pirarucu is one of the largest freshwater fishes in the world. At one time, there were many individuals over 3 meters in length that weighed more than 150 kilograms. The scales on a pirarucu this size can reach 6 centimeters in length. However, there are few pirarucu this size, if any, that are living currently. The average size of this species has greatly reduced due to over-fishing, though it is still common to find pirarucu over 2 meters that weigh more than125 kilograms. The pirarucu is usually grey in color with an orange speckling near its posterior end. There are also two symmetrical fins on either side of the body at the posterior end. Interestingly, A. gigas has a bony or toothed tongue, which is the source of the title osteoglossomorph and a distinguishing character of those species in the order Osteoglossiformes.

(Luna and Froese, 2002; Goulding, 1993; Goulding, 1980; Smith, 1981).

The female pirarucu is sexually mature at the age of five years old and are typically 160 centimeters in length at this point in their life.

(Queiroz, 1998)

A. gigas communicates with it's offspring by means of attractive pheromones, which keep the offspring near the parents.

(Lowe-McConnell, 1987)

A. gigas is a predator that mainly eats other fish. If a bird or some other animal happens to be present, this large predator will also eat that animal. The pirarucu usually finds food near the top of the water because it is an obligate air breather that needs to surface every 10-20 min. However, the pirarucu is also capable of diving.

(Lowe-McConnell, 1987; Goulding, 1980)

The pirarucu's sheer size and bony armor provide defenses against predators.

There are no known adverse effects towards Homo sapiens.

A. gigas is hunted and utilized in many ways by local human populations. Pirarucu are harpooned or caught in large nets and the meat is said to be delicious. One individual can yield seventy kilograms of meat. In addition, the pirarucu's bony tongue is often used to scrape cylinders of dried guarana, an ingredient in a beverage, and the bony scales are used as nail files. This animal also appears in the pet trade, although to keep a pirarucu correctly requires a large tank and can prove quite difficult.

(Smith, 1981)

In 1976, the SUDEPE (Supertendencia do Desenvolvimento da Pesca) outlawed the killing of a pirarucu from October to March, during the low water season when this animal becomes so visible due to it's sheer size. Also the SUDEPE declared that the pirarucu has to be at least one and a half meters in length before it can be killed.

(Smith, 1981; Goulding, 1980)

A. gigas was first named by Georges Cuvier in 1817. This animal is often called a living fossil due to it's archaic morphology. This fish has also been extremely successful in the Amazon. However, due to overfishing this animal is in danger of becoming extinct.