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Nematolebias whitei, Rio pearlfish : fisheries, aquarium
> Cyprinodontiformes (Rivulines, killifishes and live bearers) > Rivulidae (Rivulines) > Cynolebiinae
Etymology: Nematolebias:Greek, nema, -atos = filament + Greek, lebias, ou = a kind of small fish (Ref. 45335). Eponymy: General Thomas Dresser White (1901–1965) was the Chief of Staff, United States Air Force, in which he served (1924–1961), having initially been an infantry officer (1920–1924). [...] (Ref. 128868), visit book page. More on author: Myers.
البيئة: الوسط / المنطقة المناخية / نطاق العمق / نطاق التوزيع البيئة
; المياه العذبة قاعية التغذية و المعيشة; pH range: 6.5 - 7.0; dH range: 5 - 8; غير مهاجرة (Ref. 126106). Tropical; 20°C - 23°C (Ref. 1672)
الأشواك الظهرية (المجموع) : 0; الأشعة الظهرية الناعمة (المجموع) : 13 - 19; شوكة شرجية: 0; أشعه شرجية لينه: 18 - 24; فقرات: 29 - 31. Having series of small bluish white spots, often coalesced to form continuous or fragmented line, on subdistal area of caudal fin and dark brown to black stripe on border of anal fin, adjacent and parallel to perpendicular extensions of subdistal golden transverse lines. Dorsal head profile slightly convex to nearly straight in male, gently concave to approximately straight in female (Ref. 42934). Body shape (shape guide): fusiform / normal.
Adults occur in small freshwater temporary pools in floodplains of streams and lagoons. These pools are shallow with compact, soft reddish brown muddy bottom and dry twice a year, during winter, usually from July to August, and during summer, usually from February to March. During dry season, all fish die and eggs undergo in diapause within the substrate. Eclosion happens at the onset of wet season, usually March-April and September-October (Ref. 42934). This species was introduced in California (Ref. 4357). Bottom spawner, 4 months incubation. Is easy to maintain in the aquarium (Ref. 27139).
دورة الحياة وسلوك التزاوج النضج | التكاثر | وضع البيض | بيض | الخصوبة | اليرقات
Males are territorial and very aggressive. Males display an elaborate courtship behavior beginning with waving lateral movement in front of female, with the unpaired fins completely opened. In an oblique position, the male touches the bottom surface with the anterior portion of its head, with vibrating body. The female placed her body side to side with the male. Then both couple dives into the substrates where spawning takes place (Ref. 42934).
Costa, W.J.E.M., 2002. The neotropical seasonal fish genus Nematolebias (Cyprinodontiformes: Rivulidae: Cynolebiatinae): taxonomic revision with description of a new species. Ichthyol. Explor. Freshwat. 13(1):41-52. (Ref. 42934)
حالة القائمة الحمراء للاتحاد الدولي لحفظ الطبيعة والموارد الطبيعية (Ref. 130435: Version 2025-2 (Global))
في خطر (EN) (B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v)); Date assessed: 18 May 2022
مؤشر التنوع الشُعبي الوراثي (مرجع 82804): PD50 = 0.6250 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01122 (0.00514 - 0.02450), b=3.04 (2.87 - 3.21), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
مستوى غذائي (مرجع 69278): 3.3 ±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 (tm=0.1).
ضعف الصيد (Ref. 59153): Low vulnerability (10 of 100). 🛈
