|Scientific Name:||Myxine australis|
|Species Authority:||Jenyns, 1842|
Myxine acutifrons Garman, 1899
|Red List Category & Criteria:||Least Concern ver 3.1|
|Reviewer(s):||Polidoro, B., Knapp, L. & Carpenter, K.E.|
This species is widespread and common. Although this species is likely impacted by shallow-water bottom trawling within at least parts of its range, there is no indication of widespread population decline. Globally it is listed as Least Concern.
Only two specimens have been collected from Brazil, and bottom trawling is occurring throughout this species known depth and distribution range. However, more information is needed to determine this species distribution, population status, and impact of trawling within Brazil. In Brazil it therefore has a regional assessment of Data Deficient.
|Range Description:||This species is located off the southern coast of South America, from southern Brazil (Rio Grande do Sul) to southern Chile (Golfo de Corcovado, Chiloé Island), including Tierra del Fuego and Strait of Magellan (Mincarone and Soto 2001). It was also reported from the South Shetland Islands based on a single 230 mm specimen (Norman 1937, Hureau and Fischer 1985, Fernholm 1990).|
Native:Argentina; Brazil; Chile
|FAO Marine Fishing Areas:||
Atlantic – Antarctic; Atlantic – southwest; Pacific – southeast
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species is known to be common, particularly along the coast of Argentina. However there are no data to interpret population levels and rates of decline.|
|Habitat and Ecology:||
This species is usually taken on muddy bottoms in shallow coastal waters at depths from 4-146 m. The Brazilian record is based on only two females, 250-292 mm, taken on the continental shelf at 30-45m depth (Mincarone and Soto 2001, Mincarone 2003). Of 86 specimens examined by Wisner and McMillan (1995), 71 (82%) were female, 12 (14%) male, and three (4%) hermaphroditic. Numbers and sizes of large eggs range from 9 (24 x 8 mm) in a female of 330 mm to 16 (21 x 7 mm) in one of 345 mm.
The biology of this species is unknown and its copulatory organ is absent. The gonads of hagfishes are situated in the peritoneal cavity. The ovary is found in the anterior portion of the gonad, and the testis is found in the posterior part. The animal becomes female if the cranial part of the gonad develops or male if the caudal part undergoes differentiation. If none develops, then the animal becomes sterile. If both anterior and posterior parts develop, then the animal becomes a functional hermaphrodite. However, hermaphroditism being characterised as functional needs to be validated by more reproduction studies (Patzner 1998).
|Major Threat(s):||The species' distribution and habitat overlaps with an area that is extensively impacted by trawl fisheries.|
|Conservation Actions:||There are no conservation measures in place, but more research is needed on this species' biology, population size, distribution and impact of fisheries activities.|
|Citation:||Mincarone, M.M. 2013. Myxine australis. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 01 March 2015.|