It is a requiem shark commonly found worldwide in warm, shallow waters along coasts and in rivers. It is known for its aggressive nature, and presence in warm, shallow brackish and freshwater systems including estuaries and rivers. They can thrive in both salt and fresh water and can travel far up rivers. They have been sighted and caught in many rivers , such as the Mekong, Mississippi and the Amazon. The species has been spotted 2,500 miles (4,000 kilometers) up the Amazon River in South America and dwell in Lake Nicaragua, a freshwater lake in Central America. It can reach a maximum size of 3.5 m (11 ft). https://www.zazzle.com/bull_shark_poster-228243704226737193

They are relatively large disc shaped cichlids. Depending upon the variety, they can reach up to about 6 -10" (15 – 25 cm) in length. They are the most laterally compressed (flattened) of all the cichlids. Within each species there is great variety in shading, patterning, and body types. Discus are native to the South American countries of Brazil, Peru, Venezuela, and Columbia and are found inhabiting the tributaries of the Amazon River within those countries.  https://www.zazzle.com/discus_poster-228104118166606496

  Jacunda (or Mataguaro) refers to several species of Pike Cichlid that live in the Amazon basin. They are predatory and feed on fish, insects, and other small animals. They usually place themselves where they can stay undetected by the prey, like close to a sunken tree stem or behind a rock. The biggest pike cichlids can grow to about 50 cm (20 in) long. https://www.zazzle.com/jacunda_poster-228996079266300019

Is also known as the red piranha is native to the Amazon , Paraguay, Paraná and Essequibo river basins, as well as coastal rivers of northeastern Brazil in South America. Sometimes, they may inhabit flooded forests such as those found in the Brazilian Amazon. They live in shoals but do not group hunt, although they may occasionally enter into feeding frenzies. In the case of a feeding frenzy, schools of piranha will converge on one large prey individual and eat it within minutes. can reach up to 3.9 kg (8 lb 10 oz) in weight and 50 cm (20 in) in length. https://www.zazzle.com/red_belly_piranha_poster-228933370635485736

It is also known as the black piranha, white piranha, spotted piranha or yellow piranha. They are found in the drainage systems of the Amazon and Orinoco as well as the Essequibo River and other rivers of the Guiana Shield and the coastal rivers of northeastern Brazil. It is one of the larger species of piranha with a maximum recorded length of 41.5 centimeters (16.3 in) and they attain a maximum weight of 3.0 kilograms (6.6 lb).  https://www.zazzle.com/redeye_piranha_poster-228790331535199144

  It is a member of the cichlid family. Its native range is South America: Amazon River basin in Peru, Colombia and Brazil. It can reach a length of 45.7 cm (18 in) with a max weight of 1.6 kg (3.5 lbs). It prefers quiet shallow waters in mud-bottomed and sand-bottomed canals and ponds. It feeds on small fish, crayfish, worms and insect larvae. https://www.zazzle.com/oscar_poster-228962238726594164