Eptatretus indrambaryai 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Myxini Myxiniformes Myxinidae

Scientific Name: Eptatretus indrambaryai Wongratana, 1983
Taxonomic Notes: The species name was misspelled once by Wongratana (1983) as E. indambaryai in the species heading and indrambaryi in Table 1. This species is named after Mr. Boon Indrambarya, therefore E. indrambaryai is the correct spelling.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2011
Date Assessed: 2009-11-10
Assessor(s): Mincarone, M.M.
Reviewer(s): Polidoro, B., Knapp, L. & Carpenter, K.E.
This species s only known from 11 specimens taken in the Andaman Sea, Thailand. This deepwater species may be threatened by bottom trawling within its apparent restricted range. However, its range may be larger than what is known. Currently it is listed as Least Concern, but more research is needed on this species distribution, population, biology, life history, and potential impacts.

Geographic Range [top]

Range Description:This species is known from the Andaman Sea, Thailand (Wongratana 1983).
Countries occurrence:
FAO Marine Fishing Areas:
Indian Ocean – eastern
Additional data:
Lower depth limit (metres):400
Upper depth limit (metres):267
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population of this species is known from only 11 type specimens. This could be a restricted range species but more surveys are necessary to verify this.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species is known only from 11 specimens, of which four were caught from Nagasaki-maru deep-sea shrimp station 3 (7°37'02''N, 97°52'00''E), on 10 November 1981, in the third and final overnight catch experiment in a series of 80 shrimp traps. The experiments were randomly distributed on the continental slope of 45-60°, at depths of about 267-400 m, and bottom temperature 12.2-11.1°C, respectively. The bottom was recorded as sandy mud with patches of rocks or possibly boulders. Each specimen was caught in a separate trap without accompanying fauna (Wongratana 1983).

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).

Threats [top]

Major Threat(s): There are no known direct threats to this species but it may be vulnerable to offshore bottom trawling.

Conservation Actions [top]

Conservation Actions: There are no conservation measurements in place, but more research is needed on this species' biology, population size, distribution and impacts.

Classifications [top]

11. Marine Deep Benthic -> 11.1. Marine Deep Benthic - Continental Slope/Bathyl Zone (200-4,000m) -> 11.1.2. Soft Substrate

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
In-Place Education
5. Biological resource use -> 5.4. Fishing & harvesting aquatic resources -> 5.4.4. Unintentional effects: (large scale) [harvest]
♦ timing:Ongoing    
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology

Bibliography [top]

IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: (Accessed: 30 June 2017).

Monkolprasit, S., Sontirat, S., Vimollohakarn, S., and Songsirikul, T. 1997. Checklist of fishes in Thailand. Office of Environmental Policy and Planning.

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.

Wongratana, T. 1983. Diagnosis of 24 new species and proposal of new name for a species of Indo-Pacific clupeoid fishes. Japanese Journal of Ichthyology 29(4): 385-407.

Citation: Mincarone, M.M. 2011. Eptatretus indrambaryai. The IUCN Red List of Threatened Species 2011: e.T196027A8994787. . Downloaded on 24 June 2018.
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