Elasmobranchii (haaien en roggen) (sharks and rays) >
Torpediniformes (Electric rays) >
Narcinidae (Numbfishes)
Etymology: Narcine: Greek, narke = numbness (Ref. 45335); insolita: Name from Latin 'insolitus' meaning unusual or uncommon; referring to the unusual and unique disparate dimensions of the dorsal fins, treated as an adjective (feminine)..
Environment: milieu / climate zone / depth range / distribution range
Ecologie
marien demersaal; diepte 150 - 175 m (Ref. 93929). Tropical; 15°S - 25°S, 42°E - 45°E (Ref. 114953)
Western Indian Ocean: Madagascar.
Lengte bij maturiteit / Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - 35.6 cm
Max length : 35.6 cm TL (female)
Korte beschrijving
Morfologie | Morfometrie
Wervels: 119 - 127. This species is distinguished from all its congeners by the following characters: unique presence of a very large and prominent first dorsal fin that is conspicuously taller, larger and with a longer base than the second dorsal fin; large spiracles, conspicuously rounded, not projecting anteriorly lateral to eyes, and with elevated rims all around; interspiracular distance much smaller than interorbital distance; small, broadly rounded lateral cusplets adjacent to principal cusp on teeth of more concealed inner rows; upper and lower tooth bands equal in width and broadly circular in outline; dorsal colouration composed of a yellowish brown background with darker brown to reddish brown irregular blotches on disc margins, posterior disc and anterior margin of snout; darker brown blotches on anterior portion of dorsal and caudal fins, at caudal apex, and laterally on tail at level of dorsal fins; precaudal vertebrae 68-71; total vertebrae 119-127 (Ref. 93929).
Usually found over predominantly muddy substrata (Ref. 93929). Maturity size of males at ca. 27 cm TL; birth size at ca. 14 cm TL (Ref. 114953).
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
de Carvalho, M.R., B. Séret and L.J.V. Compagno, 2002. A new species of electric ray of the genus Narcine Henle, 1834 from the South-western Indian Ocean (Chondrichthyes: Torpediniformes: Narcinidae). S. Afr. J. mar. Sci. 24:135-149. (Ref. 93929)
Status op de Rode Lijst van het IUCN (Ref. 126983)
Gevaar voor de mens
Harmless
Gebruik door de mens
Meer informatie
Leeftijd/GrootteGroeiLengte-gewichtLengte-lengteLengtefrequentiesMorfometrieMorfologieLarvenLarvale populatiedynamiekRekruteringAbundantieBRUVS
ReferentiesAquacultuurAquacultuurprofielKweeklijnenGeneticaAllelfrequentiesErfelijkheidZiektesVerwerkingNutrientsMassaconversie
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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=0.01175 (0.00476 - 0.02897), b=2.88 (2.66 - 3.10), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trofisch niveau (Ref.
69278): 3.1 ±0.3 se; based on size and trophs of closest relatives
Weerstandsvermogen (Ref.
120179): laag, minimale populatieverdubbelingstijd 4,5-14 jaar (Assuming fecundity<100).
Fishing Vulnerability (Ref.
59153): Low to moderate vulnerability (26 of 100).
