A Virtual Museum on the State's Fish Biodiversity

Hemiodus unimaculatus

No common name
Collection Details

Specimens

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Taxonomic Hierarchy

Actinopterygii (Ray-finned Fishes) Characiformes (Characins) Hemiodontidae Hemiodus Hemiodus unimaculatus

Description

This species account was compiled from FishBase (Froese, R. and D. Pauly. Editors. 2025. FishBase. World Wide Web electronic publication. www.fishbase.org, version 04/2025.) and processed using AI-assisted text extraction. It may contain errors in spelling, punctuation, or formatting. When citing, please reference the original source rather than this page. Learn more about our species accounts.

Characters

Body shape: fusiform / normal.

Distribution

South America: Amazon, Tocantins, Capim, Suriname, Camopi, and Oyapock River basins.

Habitat Associations

Freshwater. benthopelagic. Found in: streams.

Biology

Occurs in fast-flowing rivers over rocky substrate. Abundant in the lower part of rivers. Feeds on detritus and periphyton. Mature at about 11 cm; breeds during the rainy season (Ref. 12225). Iteroparous synchronous spawner (Ref. 51777).
Max length: 32.9 cm SL; max weight: 530 g.
Reproductive mode: dioecism; fertilization: external; guarders (nesters). Distinct pairing (Ref. 205).
IUCN Red List Status: Least Concern (LC), assessed 2020-08-20.

Commercial or Environmental Importance

Fisheries: minor commercial; aquarium: commercial.

References

Géry, J. (1977) Characoids of the world. Neptune City ; Reigate : T.F.H. [etc.]; 672 p. : ill. (chiefly col.) ; 23 cm.
Langeani, F. (2003) Hemiodontidae (Hemiodontids). p. 96-100. 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.
Brandão, C.A.S., MF.M. Valentim and E. Pellegrini-Caramaschi (2003) Ovary maturation stages and oocyte features in three species of the neotropical fish Hemiodus (Müller, 1842). Brazil. Arch. Biol. Tech. 46(3):433-441.
Lima, R.G.d.S.F., B.E. Soares, T.F. de Barros, R. Mazzoni and E.P. Caramaschi (2022) Length-weight relationships in 45 Neotropical fish species from the upper Tocantins River basin (Brazil). J. Appl. Ichthyol. 2022:1-9. DOI: 10.1111/jai.14314

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