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Teleostei (teleosts) > Characiformes (Characins) > Characidae (Characins; tetras) > Stethaprioninae
Etymology: Oligosarcus: Greek, oligos = small + Greek arkos = anus (Ref. 45335); perdido: Named for its type locality, Rio Perdido; perdido is a Portuguese for lost..

Environment: milieu / climate zone / depth range / distribution range Ecology

Freshwater; demersal. Tropical

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South America: Rio Perdido in the upper Paraguai basin, Brazil.

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 9.8 cm SL male/unsexed; (Ref. 72405)

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Dorsal soft rays (total): 11; Vertebrae: 39. Lateral line with 61-63 scales; scales around caudal peduncle 15-20; and premaxilla without enlarged foramen that accommodates the largest dentary tooth when mouth is closed (Ref. 72405).

Found in river where the upper portion is located on a carbonate plateau of about 68 km long. The river in the plateau is dammed by calcareous tufa deposits, forming 1 to 6 m tall sequences of waterfalls. The substrate is composed of many logs, branches and whole trees ling on whitish calcareous clay. Inhabits stretches with sluggish to still waters and appears to occur in low densities. Adults are active from dusk to around 21:00 from near the surface to 2 m deep and always solitary and observed resting after this time along the vertical rocky banks. They remain hidden during the daylight hours. Young fish are observed active during the day, in small groups of 5-6 individuals (Ref. 72405).

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Ribeiro, A.C., M.R. Cavallaro and O. Froehlich, 2007. Oligosarcus perdido (Characiformes, Characidae), a new species of freshwater fish from Serra da Bodoquena, upper Rio Paraguai basin, Brazil. Zootaxa 1560:43-53. (Ref. 72405)

IUCN Red List Status (Ref. 130435)

Least Concern (LC) ; Date assessed: 07 November 2018

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

FAO - Publication: search | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.01000 (0.00444 - 0.02253), b=3.08 (2.90 - 3.26), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245).

Trophic level (Ref. 69278): 3.8 ±0.6 se; based on size and trophs of closest relatives

Resilience (Ref. 120179): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100).

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Oligosarcus perdido Ribeiro, Cavallaro & Froehlich, 2007