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Nannostomus beckfordi, Golden pencilfish : fisheries, aquaculture, aquarium
> Characiformes (Characins) > Lebiasinidae (Pencilfishes) > Pyrrhulininae
Etymology: Nannostomus:Latin, nannus = small + Greek, stoma = mouth (Ref. 45335). Eponymy: F J B Beckford (1842–1920) of Winchester was a naturalist and one of the early bee-keepers in Hampshire. He presented the pencilfish holotype to the BMNH, it being part of a collection he had made on the coast of Demerara, British Guiana (Guyana). (Ref. 128868), visit book page. More on author: Günther.
Taxonomic Remarks The most recent distributional records were published by Weitzman & Weitzman (1982: Fig. 229). Most recent systematic description by Weitzman (1966). Commonly exported as an aquarium fish since 1910, Stansch (1914). The courtship and other behavior was studied in detail by Caplan & Dunham (1978) and Kuenzer (1982). Probably introduced into rio Jaquraipe, east of Salvador, Bahia Brazil, Géry (1977) and definitely introduced into baía de Guanabara, Rio de Janeiro, Bizerril & Lima (2001). This species is commonly exported as an aquarium fish from Peru and Guyana.
البيئة: الوسط / المنطقة المناخية / نطاق العمق / نطاق التوزيع البيئة
South America: native in the rivers of Guyana south to the Amazon basin and up the Amazon River to the Negro River.
الحجم / وزن / العمر
النضج: Lm? range ? - ? cm Max length : 6.5 cm SL ذكر/ مختلط الجنس; (Ref. 7020)
Inhabits small rivers with little current and in swamps where they are very common. Forms groups where the males dominate to defend their territory. Is highly appreciated by aquarists (Ref. 12225). Feeds on worms, crustaceans and insects (Ref. 7020). Aquarium keeping: in groups of 5 or more individuals; minimum aquarium size 60 cm (Ref. 51539).
دورة الحياة وسلوك التزاوج النضج | التكاثر | وضع البيض | بيض | الخصوبة | اليرقات
At spawning time in captivity, male and female swim alongside one another. Several batches of 1 to 5 eggs are laid among the fine-leaved plants, with a total of up to 200 eggs in some cases; eggs hatch in 30 to 40 hours and fry are free-swimming about six days after (Ref. 7020). Between 24°-27°C, eggs hatch in 24 hours (Ref. 205).
Planquette, P., P. Keith and P.-Y. Le Bail, 1996. Atlas des poissons d'eau douce de Guyane. Tome 1. Collection du Patrimoine Naturel Volume 22, MNHN, Paris & INRA, Paris. 429 p. (Ref. 12225)
حالة القائمة الحمراء للاتحاد الدولي لحفظ الطبيعة والموارد الطبيعية (Ref. 130435: Version 2025-2 (Global))
مؤشر التنوع الشُعبي الوراثي (مرجع 82804): PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00646 (0.00324 - 0.01288), b=3.08 (2.90 - 3.26), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
مستوى غذائي (مرجع 69278): 3.3 ±0.39 se; based on food items.
المرونه (مرجع 120179): وسيط, الحد الزمني الأدني لتضاعف عدد أفراد المجتمع 1.4-4.4 سنة (Fec = 200).
ضعف الصيد (Ref. 59153): Low vulnerability (10 of 100). 🛈
