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Narcine tasmaniensis

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA CHONDRICHTHYES RAJIFORMES NARCINIDAE

Scientific Name: Narcine tasmaniensis
Species Authority: Richardson, 1841
Common Name(s):
English Tasmanian Numbfish, Little Numbfish, Electric Torpedo, Electric Ray

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2009
Date Assessed: 2008-12-01
Assessor(s): Treloar, M.A.
Reviewer(s): Fowler, S.L., Stevens, J. & Valenti, S.V. (Shark Red List Authority)
Justification:
This Australian endemic electric ray is fairly common in Tasmanian waters and also occurs on the New South Wales and South Australian shallow continental slope and shelf. Although there are no significant threats to this species, it is a trawl fishery bycatch and its discard mortality rate is unknown. It is listed as Least Concern because it is a relatively fecund species and there are no major threats to populations at the present time, and therefore no reason to suspect that the species has declined.

Geographic Range [top]

Range Description: Eastern Indian and southwest Pacific Oceans: widespread in southeastern Australia from Coffs Harbour (New South Wales) to at least Beachport (South Australia), and around Tasmania (Last and Stevens 1994). May also occur further west into the Great Australian Bight (Last and Stevens 1994).
Countries:
Native:
Australia (New South Wales, South Australia, Tasmania)
FAO Marine Fishing Areas:
Native:
Indian Ocean – eastern; Pacific – southwest
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Around southern Tasmania, populations of breeding females together with a number of mature males have been collected but no immature males (R. Daley CSIRO pers. comm. August 2004).
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: Around Tasmania, restricted to the continental slope (rarely deeper than 100 m and fairly common near the shore). Further north, mainly on the continental slope in 200–600 m depth (Last and Stevens 1994). A medium sized numbfish found on sand or mud bottoms, and sometimes near rocky reefs. Reaches at least 47 cm total length (TL). Males reach maturity at 21–26 cm TL and females at 20–26 cm TL (R. Daley CSIRO Hobart unpublished data). Aplacental yolk sac viviparous; size at birth is 9–12 cm TL (R. Daley CSIRO Hobart unpublished data). Litter size averages three and ranges from one to eight (R. Daley CSIRO Hobart unpub. data). The diet is dominated by polychaete worms but also feeding on garmarid (benthic) amphipods and crabs (R. Daley CSIRO Hobart unpublished data).
Systems: Marine

Threats [top]

Major Threat(s): Caught as bycatch by trawlers in the South East Trawl Fishery and formerly by scallop dredgers. Discard mortality rate unknown but expected to be small.

Conservation Actions [top]

Conservation Actions: None in place.

Citation: Treloar, M.A. 2009. Narcine tasmaniensis. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 16 September 2014.
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