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Characiformes (Characins) >
Characidae (Characins; tetras) > Stevardiinae
Etymology: Hemibrycon: Greek, hemi = half + Greek, bryko = to bite (Ref. 45335); divisorensis: Named for its type locality, Zona Reservada Sierra del Divisor; noun in apposition..
Environment: milieu / climate zone / depth range / distribution range
Ecologie
; zoet water pelagisch. Tropical
South America: Río Ucayali drainage in Peru.
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 6.8 cm SL mannelijk / geslacht onbekend; (Ref. 75799); 8.2 cm SL (female)
Korte beschrijving
Determinatiesleutels | Morfologie | Morfometrie
Dorsale zachte stralen (totaal) : 8; Anale zachte stralen: 25 - 28; Wervels: 38 - 39. This species is distinguished from its congeners by the following characters: a wide black asymmetrical spot covering base of caudal-fin rays, extending along entire length of caudal-fin rays 9 to 12-13 (except H. surinamensis); a black band in the lower half of the caudal peduncle from the region above the last anal-fin rays to the caudal-fin base; 4-5 scale rows below lateral line (vs. 5-9) except from H. mikrostiktos and H. surinamensis (Ref. 75799); differs from H. mikrostiktos by the number of branched anal-fin rays (24-30 vs. 18-21), and from H. surinamensis by the number of scale sheath along anal-fin base (17-22 vs. 12-17), and by the number of cusps in the inner row of the premaxilla teeth (5-7 vs. 4-5) (Ref. 85819).
Type specimens were collected at the tributaries of río Tapiche which are about 2-3 m wide with crystalline water, 0.3-0.5 m deep, medium water current, sandy substrate, and with moderate amount of riparian vegetation. This species has a typical aquasperm with a spherical to slightly ovoid nucleus , suggesting that the species is non-inseminating. It was not possible to verify the presence of spermatozoa in the ovaries due to the lack of mature females. Mature males possess bony hooks on rays of all fins, except the caudal fin; the presence of which may represent a secondary sexual character (Ref. 75799).
Levenscyclus en paargedrag
Maturities | Voortplanting | Spawnings | Egg(s) | Fecundities | Larven
Bertaco, V.A. and L.R. Malabarba, 2010. A review of the Cis-Andean species of Hemibrycon Günther (Teleostei: Characiformes: Characidae: Stevardiinae), with description of two new species. Neotrop. Ichthyol. 8(4):737-770. (Ref. 85819)
Status op de Rode Lijst van het IUCN (Ref. 130435)
Gevaar voor de mens
Harmless
Gebruik door de mens
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Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00813 (0.00372 - 0.01775), b=3.09 (2.90 - 3.28), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trofisch niveau (Ref.
69278): 3.0 ±0.4 se; based on size and trophs of closest relatives
Weerstandsvermogen (Ref.
120179): Hoog, minimale populatieverdubbelingstijd minder dan 15 maanden (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
