Overview

Comprehensive Description

P. siamensis :

BMNH 1897.10.8.126, holotype , 76.5 mm SL; Thailand : Chao Phraya basin, Bangpakong River . ANSP 59284 (1), 42.4 mm SL [ holotype of Leiocassis bicolor ZBK ] ; ANSP 59285-59289 (5), 37.6-45.6 mm SL [ paratypes of Leiocassis bicolor ZBK ]; Thailand : Chieng Mai . ANSP 60178 (1), 85.6 mm SL [ holotype of Leiocassis albicollaris ZBK ]; Thailand : Bangkok . CAS 94782, 64: 30.4-107.0; Cambodia : Ratanakiri Province , O Champha, 4-8 km upstream from its mouth into Tonle San near Te Veng .

  • Heok Hee Ng, Kelvin K. P. Lim (2005): The identity of Pseudomystus moeschii (Boulenger, 1890), with the description of two new species of bagrid catfishes from Southeast Asia (Teleostei: Bagridae). Zootaxa 851, 1-18: 16-16, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:02BCB677-51EC-45E2-9323-F8EF59D32B7A
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Biology

Occurs in rivers and streams (Ref. 12693). Found in the basin wide tributary of the lower Mekong (Ref. 36667). Feeds on aquatic insect larvae, including odonatans. Adult females captured in February had well-developed ova. Spawning takes place at the beginning of the rainy season, with the young appearing in fishing nets during August. Market fresh (Ref. 12693).
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Distribution

Range Description

The species is widely distributed throughout mainland southeast Asia. It is found in the lower Mekong, Mae Klong, and Chao Phraya basins (Kottelat 1998), and river systems on both slopes of the Malay Peninsula, and in coastal drainages in southeastern Thailand (Vidthayanon et al. 1997).

In the Mekong, it is found in major tributaries (e.g., the Xe Kong; Kottelat 2011).
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Southeastern Asia: Mekong and Chao Phraya basins and peninsular Thailand.
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Asia: Chao Phraya and Mekong basins (Ref. 27732). Reported from Maeklong, Peninsular and Southeast Thailand river systems (Ref. 26336).
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Physical Description

Morphology

Dorsal spines (total): 1; Dorsal soft rays (total): 7; Analsoft rays: 16 - 17
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Size

Maximum size: 200 mm TL
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Max. size

15.0 cm SL (male/unsexed; (Ref. 43281))
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Diagnostic Description

Irregular vertical bars on a yellowish to dark grey background (sometime plain dark body); hyaline caudal fin with or without a single black blotch on each caudal lobe; short barbels (maxillary barbels not reaching base of pectoral spine); body depth at dorsal-fin origin larger than head width; a high, rounded adipose fin (Ref. 27732).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
The species occurs in a wide range of habitats including rivers and streams, marshlands, and peat swamps. It is slightly adaptive to impounded waters and man-made wetlands. Migratory movements are uncertain, but seems to undertake seasonal movements (Baran et al. 2005).

Systems
  • Freshwater
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Environment

demersal; freshwater; pH range: 6.0 - 8.0; dH range: 4 - 25
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Life History and Behavior

Life Cycle

The male guards the eggs.
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2012

Assessor/s
Ng, H.H.

Reviewer/s
Allen, D. & Smith, K.

Contributor/s

Justification
This is an abundant species at least throughout the middle and lower Mekong River drainage. In the absence of any major threats identified for this species, it is assessed as Least Concern, however further research into threats is required.
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Population

Population
There is no information on the population and its trends for this species, but survey data indicate that it is still an abundant species, particularly in the Mekong River drainage.

Population Trend
Unknown
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Threats

Major Threats
The threats to this species are unknown, since there is limited information on the biology of this species and therefore the impact of potential threats (especially those of an anthropogenic nature) remains unknown. The current threats to aquatic biodiversity in all of its known distribution have also not been adequately identified.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
There is insufficient information on the distribution, biology and potential threats for this species. Catch data for this species are also needed.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: commercial; aquarium: commercial
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