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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.
Issue
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.
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 底生の漂泳性; pH range: 6.0 - 8.0; dH range: 5 - 19. Tropical; 24°C - 26°C (Ref. 1672)
South America: native in the rivers of Guyana south to the Amazon basin and up the Amazon River to the Negro River.
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 6.5 cm SL オス/雌雄の選別がない; (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).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
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)
IUCNのレッドリストの状況は (Ref. 130435: Version 2024-2)
Human uses
水産業: 商業; 水産養殖: 商業; 水族館・水槽: 商業
用具
特記事項
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インターネットの情報源
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=0.00646 (0.00318 - 0.01311), b=3.04 (2.86 - 3.22), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
栄養段階 (Ref.
69278): 3.3 ±0.39 se; based on food items.
回復力 (Ref.
120179): 手段, １．４年～４．４年の倍増期間の最小個体群 (Fec = 200).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
