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Characiformes (Characins) >
Acestrorhamphidae (American tetras) > Acestrorhamphinae
Etymology: Oligosarcus: Greek, oligos = small + Greek arkos = anus (Ref. 45335); perdido: Named for its type locality, Rio Perdido; perdido is a Portuguese for lost.
環境：環境 / 気候帯 / 深さの範囲 / 分布範囲
生態学
; 新鮮な水 底生の. Tropical
South America: Rio Perdido in the upper Paraguai basin, Brazil.
サイズ / 重さ / 年齢
成熟: Lm ? range ? - ? cm
Max length : 9.8 cm SL オス/雌雄の選別がない; (Ref. 72405)
簡単な記述
検索表 | 形態学 | 形態計測学
背鰭 (合計) : 11; 脊つい: 39. Lateral line with 61-63 scales; scales around caudal peduncle 15-20; and premaxilla without enlarged foramen that accommodates the largest dentary tooth when mouth is closed (Ref. 72405).
Body shape (shape guide): fusiform / normal.
Found in river where the upper portion is located on a carbonate plateau of about 68 km long. The river in the plateau is dammed by calcareous tufa deposits, forming 1 to 6 m tall sequences of waterfalls. The substrate is composed of many logs, branches and whole trees ling on whitish calcareous clay. Inhabits stretches with sluggish to still waters and appears to occur in low densities. Adults are active from dusk to around 21:00 from near the surface to 2 m deep and always solitary and observed resting after this time along the vertical rocky banks. They remain hidden during the daylight hours. Young fish are observed active during the day, in small groups of 5-6 individuals (Ref. 72405).
ライフサイクルと交尾行動
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Ribeiro, A.C., M.R. Cavallaro and O. Froehlich, 2007. Oligosarcus perdido (Characiformes, Characidae), a new species of freshwater fish from Serra da Bodoquena, upper Rio Paraguai basin, Brazil. Zootaxa 1560:43-53. (Ref. 72405)
IUCNのレッドリストの状況は (Ref. 130435: Version 2025-2 (Global))
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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 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00891 (0.00388 - 0.02045), b=3.10 (2.92 - 3.28), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
栄養段階 (参照
69278): 3.8 ±0.6 se; based on size and trophs of closest relatives
回復力 (参照
120179): 高い, １５か月以下の倍増期間の最小個体群 (Preliminary K or Fecundity.).
漁業の脆弱性 (Ref.
59153): Low vulnerability (10 of 100).
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