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Characiformes (Characins) >
Characidae (Characins; tetras) > Stevardiinae
Etymology: Hemibrycon: Greek, hemi = half + Greek, bryko = to bite (Ref. 45335); sanjuanensis: Named for the San Juan River Basin, where the type series was collected..
Environment: milieu / climate zone / depth range / distribution range
Ecologia
; Água doce bentopelágico; pH range: 6.3 - 7.7; intervalo de profundidade 0 - 3 m (Ref. 98056). Tropical; 17°C - 22°C (Ref. 98056)
South America: upper San Juan River Basin, Tatamá River drainage in Colombia.
Tamanho / Peso / Idade
Maturity: Lm ? range ? - ? cm
Max length : 8.5 cm SL macho/indeterminado; (Ref. 98056)
Descrição suscinta
Morfologia | Morfometria
Raios dorsais (total): 10-11; Vértebras: 39 - 41. Hemibrycon sanjuanensis can be distinguished from H. boquiae, H. brevispini, H. cairoense, H. colombianus, H. mikrostiktos, H. metae, H. palomae, H. rafaelense and H. tridens by having a circular or oblong humeral spot located two scales posterior to the opercle (vs. 3-4 scales in H. palomae, H. rafaelense, H. brevispini and H. cairoense, and 0-1 scales in H. metae and H. boquiae). It further differs from H. colombianus in having a round or oblong humeral spot (vs. rectangular). It can be diagnosed from H. beni, H. dariensis, H. divisorensis, H. helleri, H. huambonicus, H. inambari, H. jabonero, H. jelskii, H. mikrostiktos, H. polyodon, H. quindos, H. raqueliae, H. santamartae, H. surinamensis, H. taeniurus, H. tridens and H. yacopiae by the presence of melanophores on the posterior margins of the scales all along the sides of body (vs. absence of melanophores from margins of scales along entire length of sides of body). It is further distinguished from all congeners mentioned above by having the following characters: a wide, concave pelvicbone (vs. narrow and straight); middle part of the dorsal margin of the orbitosphenoid bone flattened and not in contact with frontal (vs. dorsal margin straight and in contact with frontal); ventral tip of supracleithrum bifurcate (vs. not bifurcate); six teeth in the outer premaxillary row arranged in a straight line (vs. five or fewer teeth in outer premaxillary row and not arranged in straight line, except H. cairoense with two to six teeth in the outer premaxillary row) (Ref. 98056).
Found in streams characterized by relatively rapid water running over rocky and sandy substrates with high transparency. Occurs syntopically with Bryconamericus emperador, Astroblepus sp., Pimelodella sp. and Characidium sp. Feeds on adult and larval insects, nematodes, isopods, and unidentified arthropod fragments. The presence of autochthonous and some allochthonous items in the guts suggests that this species is insectivorous with considerable plasticity in its diet (Ref. 98056).
Ciclo de vida ou comportamento de acasalamento
Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas
Román-Valencia, C., R.I. Ruiz-C., D.C. Taphorn and C.A. García-Alzate, 2014. A new species of Hemibrycon (Characiformes, Characidae) from the upper San Juan River drainage, Pacific versant, Colombia. ZooKeys 454:109-125. (Ref. 98056)
Status na Lista Vermelha da UICN (Ref. 130435)
Ameaça para os humanos
Harmless
Uso pelos humanos
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Estimates based on models
Índice de diversidade filogenética (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01479 (0.00653 - 0.03348), b=2.96 (2.77 - 3.15), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Nível Trófico (Ref.
69278): 3.0 ±0.4 se; based on size and trophs of closest relatives
Resiliência (Ref.
120179): Elevada, tempo mínimo de duplicação da população menor que 15 meses (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
