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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.
البيئة: الوسط / المنطقة المناخية / نطاق العمق / نطاق التوزيع
البيئة
; المياه العذبة قاعية التغذية و المعيشة; pH range: 6.5 - 6.8. Tropical
South America: Rio Maquiné, rio Tramandaí system in Brazil.
الحجم / وزن / العمر
النضج: Lm ?  range ? - ? cm
Max length : 9.0 cm SL ذكر/ مختلط الجنس; (Ref. 96006)
وصف مختصر
مفاتيح التعريف | الوصف الخارجي | قياسات المظهر الخارجي
الأشعة الظهرية الناعمة (المجموع) : 10 - 11; فقرات: 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).
دورة الحياة وسلوك التزاوج
النضج | التكاثر | وضع البيض | بيض | الخصوبة | اليرقات
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)
حالة القائمة الحمراء للاتحاد الدولي لحفظ الطبيعة والموارد الطبيعية (Ref. 130435: Version 2025-2 (Global))
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مصادر علي الأنترنت
تقديرات تستند إلى النماذج
مؤشر التنوع الشُعبي الوراثي (مرجع 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). |
مستوى غذائي (مرجع 69278) |
2.9 ±0.4 se; based on size and trophs of closest relatives |
المرونه (مرجع 120179) |
عالي, الحد الزمني الأدني لتضاعف عدد أفراد المجتمع أقل من 15 شهر (Preliminary K or Fecundity.). |
ضعف الصيد (Ref. 59153) |
Low vulnerability (19 of 100). 🛈 |