Classification / Names
Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa
Teleostei (teleosts) >
Characiformes (Characins) >
Characidae (Characins; tetras) > Stethaprioninae
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..
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; benthopelagic; pH range: 6.5 - 6.8. Tropical
South America: Rio Maquiné, rio Tramandaí system in Brazil.
Size / Weight / Age
Maturity: Lm ? range ? - ? cm
Max length : 9.0 cm SL male/unsexed; (Ref. 96006)
Short description
Identification keys | Morphology | Morphometrics
Dorsal soft rays (total): 10 - 11; Vertebrae: 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).
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).
Life cycle and mating behavior
Maturities | Reproduction | Spawnings | Egg(s) | Fecundities | Larvae
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)
IUCN Red List Status (Ref. 130435)
Threat to humans
Harmless
Human uses
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Trophic level (Ref.
69278): 2.9 ±0.4 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).
