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Characiformes (Characins) >
Hemiodontidae (Halftooths)
Etymology: Argonectes: Greek, argos = bright and also Greek, argos = passive, sluggish + Greek, nekton = to swim (Ref. 45335).
More on author: Kner.
Issue
See Langeani (1999) for diagnoses, figure, distribution and comparison with Argonectes robertsi.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; benthopelagic. Tropical
South America: Amazon River at Japurá, Orinoco, Maroni, Negro, Trombetas, Tapajós and Canumã River basins.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 26.0 cm SL male/unsexed; (Ref. 125971); max. published weight: 312.00 g (Ref. 125971)
Frequently occurs in swift flowing waters, over a sandy bottom (Ref. 12225). Oviparous (Ref. 205).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Distinct pairing (Ref. 205).
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. (Ref. 38289)
IUCN Red List Status (Ref. 130435: Version 2025-2)
Threat to humans
Harmless
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