Elasmobranchii (sharks and rays) > Torpediniformes
(Electric rays) > Narkidae
Etymology: Heteronarce: Greek, heteros = other + Greek, narke = numbness (Ref. 45335). More on author: Regan.
Environment: milieu / climate zone / depth range / distribution range
Marine; demersal; depth range 73 - 329 m (Ref. 6589), usually - m (Ref. ). Subtropical; 0°C - ; 20°S - 35°S, 27°E - 37°E (Ref. 114953)
Western Indian Ocean: southern Mozambique to Algoa Bay, South Africa (Ref. 5578).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 25.0 cm TL male/unsexed; (Ref. 6589)
Morphology | Morphometrics
Small ray with an elongated, narrow disc and a small, narrow caudal fin (Ref. 5578). Plain brown above, white below (Ref. 5578).
Found on the outer shelf and upper slope (Ref. 5578). Life history unknown. Males reaches maturity at ca. 17 cm TL (Ref. 114953).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Compagno, L.J.V., 1986. Narkidae. p. 113-114. In M.M. Smith and P.C. Heemstra (eds.) Smiths' sea fishes. Springer-Verlag, Berlin. (Ref. 6589)
IUCN Red List Status (Ref. 124695)
Fisheries: of no interest
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 15.2 - 22, mean 18.1 °C (based on 27 cells).
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 (13 of 100) .