Hypnos monopterygius


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Hypnos monopterygius
Species Authority: (Shaw, 1795)
Common Name(s):
English Coffin Ray, Crampfish, Electric Ray, Large Numbfish, Numbfish, Numbie, Short-tail Electric Ray, Torpedo
Hypnos monopterygium (Shaw, 1795)
Hypnos subnigrum Duméril, 1852
Lophius monopterygius Shaw, 1795

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2003
Date Assessed: 2003-04-30
Needs updating
Assessor(s): Lisney, T.J. (SSG Australia & Oceania Regional Workshop, March 2003)
Reviewer(s): Kyne, P.M. & Cavanagh, R.D. (Shark Red List Authority)
This endemic ray is assessed as Least Concern as it is common and widely distributed in tropical and warm temperate Australian waters. Although it is occasionally taken as bycatch by commercial trawlers, this species is very hardy (it can survive out of water for hours), and is usually returned alive. More information on the biology of this species is required.

Geographic Range [top]

Range Description: Tropical and warm temperate Australia from St Vincents Gulf (South Australia) to Broome (Western Australia), and from Eden (New South Wales) to at least Caloundra (Queensland). A gap exists in the species' range from St Vincents Gulf (SA) to Eden (NSW). The species is not recorded from the waters of Victoria or Tasmania.
Australia (New South Wales, Queensland, South Australia, Western Australia)
FAO Marine Fishing Areas:
Indian Ocean – eastern; Pacific – southwest; Pacific – western central
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: Small, highly distinctive electric ray. This slow-moving species is commonly found inshore, buried on sandy and muddy bottoms, but also to depths of 240 m. The coffin ray uses its electric organs to stun its prey (crabs, worms and small fishes). Viviparous, with young born at about 8 to 11 cm. Reported to reach 60 cm, by rarely exceeds 40 cm. Males mature at 24 cm. A very hardy animal, it can survive out of water for hours.
Systems: Marine

Threats [top]

Major Threat(s): Trawl fishery bycatch, although its hardiness means this species is usually returned alive.

Conservation Actions [top]

Conservation Actions: There are currently no conservation measures in place for this species.

Citation: Lisney, T.J. (SSG Australia & Oceania Regional Workshop, March 2003) 2003. Hypnos monopterygius. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 29 August 2015.
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