''Myloplus arnoldi'' is a medium to large omnivorous fish of the family

Serrasalmidae The Serrasalmidae (serrasalmids) are a family of characiform fishes, recently elevated to family status. It includes more than 90 species. The name means "serrated salmon family", which refers to the serrated keel running along the belly of these ...

from South America, where it is found in the

Amazon Amazon most often refers to: * Amazons, a tribe of female warriors in Greek mythology * Amazon rainforest, a rainforest covering most of the Amazon basin * Amazon River, in South America * Amazon (company), an American multinational technology c ...

, Xingu and Tocantins River basins. It can grow to a length of . They are also called the silver dollar and are one of the fish referred to as " silver dollars". These fish are capable of delivering serious bites to humans.

Etymology

The fish is named in honor of German aquarist

Johann Paul Arnold Johann, typically a male given name, is the German form of ''Iohannes'', which is the Latin form of the Greek name ''Iōánnēs'' (), itself derived from Hebrew name ''Yochanan'' () in turn from its extended form (), meaning "Yahweh is Gracious" ...

(1869-1952), who donated the type specimens to the Zoological Museum of Berlin.

References

*Jégu, M., 2003. Serrasalminae (Pacus and piranhas). p. 182-196. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. Serrasalmidae Freshwater fish of Brazil Fish of the Amazon basin Taxa named by Ernst Ahl Fish described in 1936 {{Characiformes-stub