South Africa country information

Common names: Ornate sleeper-ray
Occurrence: endemic
Salinity: marine
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Type locality, reef off Manaba Beach near Margate, southern KwaZulu-Natal; SAIAB 78777 (holotype of Electrolux addisoni, 51.5 cm TL, 30.5 cm disc width, adult male). Recorded along an approximately 310 km. strip of coastline from Coffee Bay, Eastern Cape Province, to just north of Durban, KwaZulu-Natal inside the 50 m isobath. This conspicuous, active ray is known only from a few diver records from reefs reported over approximately two decades and its conservation status needs to be critically assessed (Ref. 75572).
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/sf.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Compagno, L.J.V. and P.C. Heemstra, 2007
National Database:

Common names from other countries

Imurnark, ... more

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: Electrolux: Name refers to the well-developed electrogenic properties of this ray, the discovery of which sheds light (Latin 'lux') on the rich and poorly known fish diversity of the Western Indian Ocean.; addisoni: Named for Mark Addison, BlueWilderness dive charters of Widenham, KwaZulu-Natal..

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

Marine; demersal; depth range 6 - 35 m (Ref. 75572). Subtropical; 30°S - 32°S, 29°E - 31°E (Ref. 114953)

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

Western Indian Ocean: South Africa from Coffee Bay (Eastern Cape Province) to Durban (KwaZulu-Natal)

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 52.0 cm TL male/unsexed; (Ref. 75572); max. published weight: 1.8 kg (Ref. 75572)

Found in warm-temperate or subtropical waters approximately 310 km of coastline with very narrow continental shelf (10-36 km wide to the 200 m isobath), however, the few sightings were all inside the 50 m isobath; on reefs with sandy or gravelly areas from close inshore to less than 50 m depth, including patches of appropriate habitat on inshore and offshore rocky banks and reefs. Apparently an infauna or meiofauna feeder, feeding on polychaete worms (including a tube-worm) and at least one small shrimp-like crustacean (Ref. 75572).

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.C. Heemstra, 2007. Electrolux addisoni, a new genus and species of electric ray from the east coast of South Africa (Rajiformes: Torpedinoidei: Narkidae), with a review of torpedinoid taxonomy. Smithiana Bull. (7):15-49. (Ref. 75572)

IUCN Red List Status (Ref. 130435)

Least Concern (LC) ; Date assessed: 25 April 2018

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

FAO(Publication : search) | FishSource |

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Estimates based on models

Preferred temperature (Ref. 115969): 23.7 - 24.1, mean 23.8 (based on 6 cells).

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 1.0002 [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): 3.3 ±0.3 se; based on size and trophs of closest relatives

Fishing Vulnerability (Ref. 59153): Moderate vulnerability (41 of 100).

Electrolux addisoni Compagno & Heemstra, 2007