Nemacheilus troglocataractus 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cypriniformes Balitoridae

Scientific Name: Nemacheilus troglocataractus
Species Authority: Kottelat & Géry, 1989

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii,v)+2ab(iii,v) ver 3.1
Year Published: 2013
Date Assessed: 2011-02-22
Assessor(s): Vidthayanon, C.
Reviewer(s): Juffe Bignoli, D., Kottelat, M. & Parenti, L.
This species has only been recorded from one subterranean stream in the Sai Yok Noi cave. Its extent of occurrence (50-100 km²) and area of occupancy (ca. 1 km²) are both very restricted, and there has been an observed decline in habitat quality and number of individuals. It is therefore assessed as Critically Endangered.
Previously published Red List assessments:
1996 Vulnerable (VU)
1994 Rare (R)
1990 Rare (R)

Geographic Range [top]

Range Description: The species is endemic to the Mae Khlong basin in one subterranean stream, in the Sai Yok Noi (=Tham Nam Tok) cave, 3 km north-northwest of Nam Tok (14°15'N, 99°04'E) Kanchanaburi Province, Thailand. Its extent of occurrence is estimated at 50-100 km² and the area of occupancy at ca. 1 km².
Countries occurrence:
Estimated area of occupancy (AOO) - km2: 1
Number of Locations: 1
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species is found in low numbers and the population has undergone a decline since it was described.
Current Population Trend: Decreasing
Additional data:
Continuing decline of mature individuals: Yes

Habitat and Ecology [top]

Habitat and Ecology: It is a cave-restricted species, inhabiting a headwater stream with a relatively low volume of water flowing over rocks, alternating with small pools and gravel-bottomed shallow reaches. Some individuals were seen adhering to rocks in fast-flowing, well-aerated water or swimming in the pools. This fish exhibits agonistic behaviour upon encounter. It feeds on benthic microorganisms.
Systems: Freshwater
Continuing decline in area, extent and/or quality of habitat: Yes
Generation Length (years): 10

Use and Trade [top]

Use and Trade: The species is occasionally seen in the aquarium trade.

Threats [top]

Major Threat(s): Disturbance from cave visitors is the main threat to this fish. Harvest for the aquarium trade is an occasional threat. Although the species is protected by law there is still occasional fishing in the area (C. Vidthayanon, pers. comm. 2011).

Conservation Actions [top]

Conservation Actions: This species is protected by Thai law. More information about the threats to this species and its ecology is needed.

Citation: Vidthayanon, C. 2013. Nemacheilus troglocataractus. The IUCN Red List of Threatened Species 2013: e.T14491A4438755. . Downloaded on 30 November 2015.
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