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Characiformes (Characins) >
Lebiasinidae (Pencilfishes) > Lebiasininae
Etymology: hoffmannorum: Named for Peter Hoffmann.
Eponymy: Dr Patrick Henri de Rham (d: 1936) is a Swiss zoologist, botanist, ichthyologist and aquarist in Lausanne, and was Expert Ecologist to the Coopération Technique Suisse. He is a Director of the Aquatic Conservation Network. (Also see Patrick and Rham) Peter Hoffmann of Salzgitter, Germany and Dr Martin Hoffmann of Hanover, Germany, collected the type specimens and, according to the etymology, it was they: “ …who managed to collect and acclimate the species and gave us precious information about [...] (Ref. 128868), visit book page.
More on authors: Géry & Zarske.
環境：環境 / 気候帯 / 深さの範囲 / 分布範囲
生態学
; 新鮮な水 外洋の. Tropical
South America: Mazaruni River, Guyana.
サイズ / 重さ / 年齢
成熟: Lm ? range ? - ? cm
Max length : 6.1 cm SL オス/雌雄の選別がない; (Ref. 47610)
背面の脊椎 (合計) : 2; 背鰭 (合計) : 8; 臀鰭: 9 - 10. Elongated body (greatest depth 4.60-5.45 in SL) with a narrow caudal peduncle; symmetrical caudal fin and a dorsal fin far backward. Transverse scales from dorsal to pelvic, 6 or 6.5; predorsal scales 15.5 or 16. Mouth somewhat superior with a short maxilla (apparent length 4.5-5.5 in HL), not quite reaching the level of the eye's front margin. Eyes relatively large. A longitudinal black band surmounted by a light line, from opercle to base of middle caudal rays (Ref. 47610).
Body shape (shape guide): elongated; Cross section: compressed.
A shy species (probably the most timorous pencil-fish species), living mainly on the surface and hidden, when possible, under a floating leaf or other hiding possibility. Swims actively, in a fitful manner, the moving of the pectorals is alternative, not symmetric. In captivity, accepts all foods, including dry ones, but only on the surface, neglecting what falls on the bottom. No peculiar nocturnal coloration; no direct courtship was yet observed, only short hunts against each other (within and between sexes) without real fights (Ref. 47610).
ライフサイクルと交尾行動
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Géry, J. and A. Zarske, 2002. Derhamia hoffmannorum gen. et sp. n. - a new pencil fish (Teleostei, Characiformes, Lebiasinidae), endemic from the Mazaruni River in Guyana. Zool. Abh., Staat. Mus. Tierk. Dresden (52):35-47. (Ref. 47610)
IUCNのレッドリストの状況は (Ref. 130435: Version 2025-2 (Global))
脆弱 (VU) (B1ab(iii,v)+2ab(iii,v)); Date assessed: 31 December 2020
人間の用途
用具
特記事項
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インターネットの情報源
モデルに基づく推定値
系統多様性指数 (参照
82804): PD
50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00692 (0.00276 - 0.01737), b=3.05 (2.83 - 3.27), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
栄養段階 (参照
69278): 3.4 ±0.4 se; based on size and trophs of closest relatives
漁業の脆弱性 (Ref.
59153): Low vulnerability (10 of 100).
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