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Characiformes (Characins) >
Acestrorhamphidae (American tetras) > Acestrorhamphinae
Etymology: Astyanax: The name of Astyanax, Hector´s son in the Greek mythology (Ref. 45335); douradilho: The specific name is a regional name for the horse color pattern consisting of a reddish brown or golden
yellow. The name is in reference to the color of the fins in live specimens. A noun in apposition.
Eponymy: Astyanax was the son of Hector in Greek mythology. See Homer’s Iliad for details. The reasoning for its use for a genus of characins is not explained. (Ref. 128868), visit book page.
Miljö: miljö / Klimatzon / djupintervall / distributionsområde
Ekologi
; sötvatten bentopelagisk; pH range: 6.5 - 6.8. Tropical
South America: Rio Maquiné, rio Tramandaí system in Brazil.
Storlek / Vikt / Ålder
Könsmognad: Lm ?  range ? - ? cm
Max length : 9.0 cm SL hane/ej könsbestämd; (Ref. 96006)
Kort beskrivning
Bestämningsnycklar | Morfologi | Morfometri
Mjukstrålar i ryggfenan (totalt) : 10 - 11; Ryggkotor: 36 - 37. Astyanax douradilho is distinguished from all congeners from the rio Uruguay basin, laguna dos Patos and rio Tramandaí systems by having 3-5 maxillary tricuspid teeth ( except A. henseli, A. laticeps, and A. paris), and by the absence of a conspicuous dark stripe from humeral region to caudal peduncle. It differs from A. henseli by having 11-12 gill rakers on lower branch of first arch (vs. 15-19), from A. laticeps by having two vertically elongated humeral spots (vs. one oval horizontally elongate), and from A. paris by having 37-39 perforated scales along the lateral line (vs. 34-36). It differs from all congeners by the following combination of characters: presence of two vertically elongate humeral spots, a conspicuous caudal spot; absence of a conspicuous dark stripe from humeral region to caudal peduncle; 3-5 maxillary tricuspid teeth; 22-24 branched anal-fin rays; 37-39 perforated scales along the lateral line; head length (26.0-29.9% SL); upper jaw length (43.8-50.6% HL); and snout length (23.0-28.6% HL) (Ref. 96006).
Body shape (shape guide): elongated.
Found in relatively small, clear water streams up to 1 m deep, with stones and rocks on bottom, and moderate riparian vegetation. Collected at around 300 m above sea level. Based on examination of several lots in fish collection, this species seems to occur only in mainstream of small rivers draining from Serra Geral formation, and was not found in the other subregion basin formed by lagoons of the Coastal Plain according to Malabarba & Isaia in 1992 (Ref. 96006).
Livscykel och parningsbeteende
Könsmognad | Reproduktion | Lek | Ägg | Fekunditet | Larver
Bertaco, V.A., 2014. Astyanax douradilho, a new characid fish from the rio Tramandai system, southern Brazil (Characiformes: Characidae). Zootaxa 3794(3):492-500. (Ref. 96006)
Status på IUCN:s rödlista (Ref. 130435: Version 2025-2 (Global))
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Harmless
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Uppskattningar baserade på modeller
Index för fylogenetisk mångfald (Ref. 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.01047 (0.00461 - 0.02381), b=3.11 (2.93 - 3.29), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245). |
Trofisk nivå (Ref. 69278) |
2.9 ±0.4 se; based on size and trophs of closest relatives |
Resiliens (Ref. 120179) |
Hög, lägsta populationsfördubblingstid mindre än 15 månader (Preliminary K or Fecundity.). |
Sårbarhet i fisket (Ref. 59153) |
Low vulnerability (19 of 100). 🛈 |