The largest of the Colossoma Genus the Tambaqui also known as the Black Pacu can grow to 30kg and upto 1m in length

SCIENTIFIC CLASSIFICATION 
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Characiformes
Family: Characidae
Subfamily: Serrasalminae
Genus: Colossoma
Species: Colossoma macropomum

Common names: Tambaqui, Back pacu

Thai name: Pacu Dam (ภาคูดำ)

Thailand status: Introduced

Max size: 35kg (77lb)

Diet: Omnivore

Habitat: Freshwater