Elasmobranchii (sharks and rays) > Torpediniformes
(Electric rays) > Narkidae
Etymology: Narke: Greek, narke = numbness (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Marine; demersal. Tropical
Indo-West Pacific: Oman and the Arabian Sea eastward to Japan and south to Singapore and Indonesia.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 18.0 cm TL male/unsexed; (Ref. 9913)
Found in continental waters, both inshore and offshore (Ref. 9913). Biology little known (Ref. 9913). The electric organs present on disc are used to stun the prey.
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Compagno, L.J.V. and P.R. Last, 1999. Narkidae. Sleeper rays. p. 1443-1446. In K.E. Carpenter and V.H. Niem (eds.) FAO identification guide for fishery purposes. The living marine resources of the Western Central Pacific. FAO, Rome. (Ref. 9913)
IUCN Red List Status (Ref. 115185)
CITES (Ref. 115941)
Fisheries: minor commercial
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Preferred temperature (Ref. 115969
): 19 - 28.2, mean 26.4 (based on 992 cells).
Phylogenetic diversity index (Ref. 82805
= 0.6252 [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. 69278
): Low, minimum population doubling time 4.5 - 14 years (Assuming fecundity<100).
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .