Betta simplex


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Betta simplex
Species Authority: Kottelat, 1994
Common Name(s):
English Krabi Mouth Brooding Betta

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2013
Date Assessed: 2011-02-21
Assessor(s): Vidthayanon, C.
Reviewer(s): Parenti, L. & Juffe Bignoli, D.
This species is known from only one location in Krabi Province southern Thailand. It covers a very small geographic range and the area of suitable habitat available for the species is limited; its extent of occurrence is estimated at less than 100 km², and its area of occupancy is estimated at less than 10 km². The species is impacted by local fishing and by habitat degradation due to agrochemical contamination and activities related to tourism. It is listed as Critically Endangered because of ongoing threats across a very limited geographic range.
1996 Vulnerable

Geographic Range [top]

Range Description: This species is endemic to Krabi Province, peninsular Thailand, where it occurs in small areas of karst spring and wetlands near Khao Thong village. It has only been recorded from one location.
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species is locally uncommon throughout its known range.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: It inhabits small karst pools, springs and streams in lowland.
Systems: Freshwater

Use and Trade [top]

Use and Trade: Occasionally this fish is traded for the aquarium trade as a rare item. It is also fished by locals and used as bait fish (pole line for Anguilla spp.).

Threats [top]

Major Threat(s): Overfishing for bait fish may threaten this species. Also habitat degradation of karst wetlands from agrochemical contamination as well as conversion for farmlands significantly threaten this species.

Conservation Actions [top]

Conservation Actions: This species is regularly bred in captivity by aquarists. Research and monitoring of populations in its habitat is needed to develop a management plan.

Bibliography [top]

IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: (Accessed: 16 June 2011).

Citation: Vidthayanon, C. 2013. Betta simplex. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 29 August 2015.
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