|Scientific Name:||Eptatretus minor|
|Species Authority:||Fernholm & Hubbs, 1981|
|Taxonomic Notes:||The 338 mm female USNM 161513 (paratype of Paramyxine springeri) is in fact an E. minor, as previously reported by Fernholm and Hubbs (1981) and confirmed by recent examination.|
|Red List Category & Criteria:||Data Deficient ver 3.1|
|Reviewer/s:||Polidoro, B., Knapp, L. & Carpenter, K.E.|
This species is only known from the Gulf of Mexico. Its distribution and known depth range directly overlaps with current and potential commercial trawling for shrimp and scallop fisheries. It has also been recorded as by-catch in these fisheries. However, the impact of trawling on this species population and habitat quality is not known. It is listed as Data Deficient. More research is needed on this species population, life history, biology and impact of trawling activity.
|Range Description:||This species is found in the northern Gulf of Mexico, from Louisiana to Florida. The area has been extensively surveyed and distribution range does not appear to extend further east or west.|
|FAO Marine Fishing Areas:||
Atlantic – western central
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species is known from a few museum specimens. Additional specimens have been recorded from trawling activities and scientific sampling efforts.|
|Habitat and Ecology:||
This species is found on the upper continental slope at depths from 300-472 m. According to Fernholm and Hubbs (1981), the bottom temperature in the distribution area is about 8.9-11.5°C, and the bottom type includes mud, sand, gravel, and corals. The northernmost records indicate an overlap in distribution of E. minor and Paramyxine springeri in the northeastern Gulf of Mexico, however it appears that E. minor lives at shallower depths (300-472 m) than P. springeri (400-730m). Eptatretus minor is a relatively short and stout species, maturing at a small size. The shortest known specimens are two mature males, 223 mm each, and a ripe female, 310 mm, with 12 eggs measuring about 31x10 mm. Some females contained ripe eggs (25-33 mm) in April, June, July, September, October, and November, suggesting that population spawned throughout the year (Fernholm and Hubbs 1981).
The copulatory organ is absent in this species. 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):||There are no known targeted threats to this species, but it is incidentally caught by bottom trawlers and possibly trappers. There are three deep-sea fisheries in the Gulf of Mexico for Rock Shrimp, Royal Red Shrimp and Calico Scallops and these operate at the depths where species occurs. The Royal Red Shrimp fishery directly overlaps with the currently known distribution range of the species and 250-475 m depth range (Stiles et al. 2007).|
|Conservation Actions:||There are no conservation measures in place, but more research is needed on this species' biology, population size, distribution and the impact of bycatch from deep-sea trawling activities, in particular pressure from Red Rock Shrimp fishery.|
Bigelow, H.B. and Schroeder, W.B. 1952. A new species of the cyclostome genus Paramyxine from the Gulf of Mexico. Breviora 8: 1-10.
Fernholm, B. and Hubbs, C.L. 1981. Western Atlantic hagfishes of the genus Eptatretus (Myxinidae) with description of two new species. Fishery Bulletin 79(1): 69-83.
IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: http://www.iucnredlist.org. (Accessed: 16 June 2011).
McEachran, J.D. and Fechhelm, J.D. 1998. Fishes of the Gulf of Mexico. Volume 1: Myxiniformes to Gasterosteiformes. University of Texas Press, Austin, Texas.
Patzner, R.A. 1998. Gonads and reproduction in hagfishes. In: J.M. Jørgensen, J.P. Lomholt, R.E. Weber, and H. Malte (eds), The biology of hagfishes, pp. 378-395. Chapman & Hall, London.
Stiles, M.L., Harrould-Kolieb, E., Faure, P., Ylitalo-Ward, H. and Hirshfield, M.F. 2007. Deep-sea trawl fisheries of the southeast US and Gulf of Mexico: Rock shrimp, Royal red shrimp, Calico scallops. OCEANA: 18.
|Citation:||Mincarone, M.M. 2011. Eptatretus minor. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 16 April 2014.|