Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (sharks and rays) > Torpediniformes (Electric rays) > Narkidae (Sleeper rays)
Etymology: Narke: Greek, narke = numbness (Ref. 45335).
More on authors: Bloch & Schneider.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; demersal; depth range 100 - ? m (Ref. 114953). Tropical; 42°N - 0°N, 55°E - 143°E (Ref. 114953)

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Indo-West Pacific; Oman (Arabian Sea) to north-east Asia (China and Japan).

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 18.0 cm TL male/unsexed; (Ref. 9913); common length : 20.0 cm TL male/unsexed; (Ref. 114953)

Found in continental waters, both inshore and offshore (Ref. 9913). Mainly feeds on crustaceans and polychaetes (Ref. 114953). Biology little known (Ref. 9913) but reported to produce 4-6 young each gestation (Ref. 114953). Adult males and females known at 15 cm TL; common size reported to reach 35 cm TL (Ref. 114953). The electric organs present on disc are used to stun the prey.

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : Carvalho, Marcelo | Collaborators

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. 130435: Version 2024-1)

Vulnerable (VU) (A2d); Date assessed: 02 November 2020

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Other (Ref. 10011)

Human uses

Fisheries: minor commercial

FAO - Publication: search | FishSource |

More information

Trophic ecology
Food items
Diet composition
Food consumption
Food rations
Predators

Ecology
Ecology

Population dynamics
Growth parameters
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
Recruitment
Abundance

Life cycle
Reproduction
Maturity
Maturity/Gills rel.
Fecundity
Spawning
Spawning aggregations
Eggs
Egg development
Larvae
Larval dynamics

Distribution
Countries
FAO areas
Ecosystems
Occurrences
Introductions
BRUVS - Videos

Anatomy
Gill area
Brain
Otolith

Physiology
Body composition
Nutrients
Oxygen consumption
Swimming type
Swimming speed
Visual pigments
Fish sound
Diseases & Parasites
Toxicity (LC50s)

Genetics
Genetics
Heterozygosity
Heritability

Human related
Aquaculture systems
Aquaculture profiles
Strains
Ciguatera cases
Stamps, coins, misc.

Outreach
Collaborators

Taxonomy
Common names
Synonyms
Morphology
Morphometrics
Pictures

References
References

Tools

Special reports

Check for Aquarium maintenance | Check for Species Fact Sheets | Check for Aquaculture Fact Sheets

Download XML

Summary page | Point data | Common names | Photos

Internet sources

Estimates based on models

Preferred temperature (Ref. 123201): 19 - 28.2, mean 26.4 °C (based on 992 cells).

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 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. 120179): Low, minimum population doubling time 4.5 - 14 years (Assuming fecundity<100).

Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100).

Price category (Ref. 80766): Unknown.

Narke dipterygia (Bloch & Schneider, 1801)