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Teleostei (teleosts) > Characiformes (Characins) > Characidae (Characins; tetras) > Stethaprioninae
Etymology: Gymnocharacinus: Greek, gymnos = naked + Greek, charax = the name of a fish (Ref. 45335).
Eponymy: Dr Frederico Guillermo ‘Carlos’ (Friedrich Wilhelm Carl) Berg (1843–1902) was a Latvian entomologist and naturalist. [...] (Ref. 128868), visit book page.
More on author: Steindachner.

Issue
Illustrated and described in more detail in Steindachner, 1903:18 Pl. 1 (fig. 2). See Géry, 1977:535 and CEAL, 1988:8 for comments. Common names according to Axelrod et al., 1991:1115 and Ortubay & Cussac, 2000:144. Threatened species according to Ortubay & Cussac, 2000:144.

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

Freshwater; demersal. Subtropical; 22°C - 26°C (Ref. 35685); 35°S - 36°S

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

South America: Valcheta stream in Rio Negro basin, Southern Argentina.

Length at first maturity / Size / Weight / Age

Maturity: L_m 3.8 range ? - ? cm
Max length : 7.5 cm TL male/unsexed; (Ref. 38376)

Short description Identification keys | Morphology | Morphometrics

Dorsal spines (total): 0; Dorsal soft rays (total): 12; Anal spines: 0; Anal soft rays: 19. Entirely naked (scale only shown on lateral line in specimens > 5 cm TL; head profile obtuse. Color is dark brown, greenish, the belly is cream; there is a copper-colored band on the flanks (Ref. 35685).

Medium sized fish considered to be the most southern characid living in temperate waters. Young with very tiny soft and delicate scales which are reabsorbed into the skin making the skin greasy and often with granulated or spongy appearance (Ref. 7252).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator | Collaborators

Ortubay, S. and V. Cussac, 2000. Threatened fishes of the world: Gymnocharacinus bergi Steindachner, 1903 (Characidae). Environ. Biol. Fishes 58:144. (Ref. 35685)

IUCN Red List Status (Ref. 130435: Version 2024-2)

Critically Endangered (CR) (B1ab(i,ii,iii,iv)+2ab(i,ii,iii,iv)); Date assessed: 29 August 2017

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

Fisheries: of no interest; aquarium: commercial

FAO - Publication: search | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00955 (0.00428 - 0.02132), b=3.12 (2.93 - 3.31), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Trophic level (Ref. 69278): 3.1 ±0.4 se; based on size and trophs of closest relatives

Generation time: 1.7 ( na - na) years. Estimated as median ln(3)/K based on 2 growth studies.

Resilience (Ref. 120179): High, minimum population doubling time less than 15 months (tm=1).

Fishing Vulnerability (Ref. 59153): Low vulnerability (22 of 100).

Gymnocharacinus bergii Steindachner, 1903