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Gymnotiformes (Knifefishes) >
Gymnotidae (Naked-back knifefishes) > Gymnotinae
Etymology: Gymnotus: Greek, gymnos = naked (Ref. 45335); capanema: Named for its type locality, the municipality of Capanema, Pará, Brazil; noun in apposition (Ref. 89487).
Environment: milieu / climate zone / depth range / distribution range
Ecologia
; Água doce bentopelágico. Tropical
South America: Brazil.
Tamanho / Peso / Idade
Maturity: Lm ? range ? - ? cm
Max length : 17.9 cm TL macho/indeterminado; (Ref. 89487)
Descrição suscinta
Morfologia | Morfometria
This species is distinguished from its congeners, except for G. pantanal, in possessing the following characteristics: a unique pigmentation pattern comprising a uniform dark brown background with prominent broad whitish or yellowish posteriorly inflected bands with dark margins, which narrow dorsally in the anterior portion of the body until they completely fade at around the position of the lateral line, never reaching or traversing the dorsal surface of the body; differs from G. pantanal in possessing 2 (vs. 1) adjacent, posteriorly facing, preopercular-mandibular sensory canal pores in the dorsoposterior portion of the preopercle. This species belongs in the G. carapo species group while G. pantanal belongs to the G. pantherinus species group. Gymnotus capanema is further distinguished from G. pantanal in possessing fewer anal-fin rays (180-205 vs. 235-280), has a deeper body (9.6-10.1% LTvs. 8.0-9.5% TL), and fewer pectoral-fin rays (11-15 vs. 16-18).
Gymnotus capanema also differs unambiguously from all other species of the G. carapo species group from the Amazon Basin and north-east Brazil, except G. curupira, G. chaviro and G. varzea, in possessing a short head (8.5-9.3% TL vs. 9.7-14.2% TL); differs from G. curupira in possessing a deeper body (9.6-10.0% TL vs. 7.4-8.6% TL), larger preorbital distance (36.4-49.7% HL vs. 34.3-36.0 HL), fewer pectoral-fin rays (11-15 vs. 16-17), fewer pored lateral-line scales to the first ventral ramus (47-56 vs. 59-62) and the distinct pigmentation reported here; from G. chaviro in possessing fewer pectoral-fin rays (12-15 vs. 18-19) and fewer anal-fin pterygiophore scale rows (5-8 vs. 12-13); from G. varzea in possessing a larger preorbital distance (36.4-49.7% HL vs. 29.7-35.8% HL), fewer anal-fin rays (180-205 vs. 230-310), fewer pectoral-fin rays (11-15 vs. 16-19) and the distinct pigmentation reported in the species description (Ref. 89487).
Facultative air-breathing in the genus (Ref. 126274)
Ciclo de vida ou comportamento de acasalamento
Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas
Milhomem, S.S.R., W.G.R. Crampton, J.C. Pieczarka, G.H. Shetka, D.S. Silva and C.Y. Nagamachi, 2012. Gymnotus capanema, a new species of electric knife fish (Gymnotiformes, Gymnotidae) from eastern Amazonia, with comments on an unusual karyotype. J. Fish Biol. 80(4):802-815. (Ref. 89487)
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=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Nível Trófico (Ref.
69278): 3.3 ±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).
