Elasmobranchii (sharks and rays) > Torpediniformes
(Electric rays) > Narkidae
Etymology: Heteronarce: Greek, heteros = other + Greek, narke = numbness (Ref. 45335). More on authors: Baranes & Randall.
Environment: milieu / climate zone / depth range / distribution range
Marine; demersal; depth range ? - 160 m (Ref. 26282). Tropical; 28°N - 13°N, 34°E - 54°E (Ref. 114953)
Western Indian Ocean: Red Sea (Gulf of Aqaba) and Gulf of Aden.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 17.6 cm NG male/unsexed; (Ref. 28618)
A benthic species found on outer continental shelf. Presumably feeds on soft bottom invertebrates such as polychaetes and crustaceans. Males reaches maturity at ca. 15 cm TL. Material rare; specimens from Gulf of Aden and Red Sea slightly differ (Ref. 114953).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Compagno, L.J.V., 1999. Checklist of living elasmobranchs. p. 471-498. In W.C. Hamlett (ed.) Sharks, skates, and rays: the biology of elasmobranch fishes. Johns Hopkins University Press, Maryland. (Ref. 35766)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 123416)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5627 [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
Trophic level (Ref. 69278
): 3.2 ±0.3 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years (Assuming fecundity<100).
Vulnerability (Ref. 59153
): Low vulnerability (16 of 100) .