Dorsal spines (total): 1; Dorsal soft rays (total):
7 - 7; Anal soft rays: 30 - 38. Relatively deep body;
lacks mid-lateral and abdominal stripes; lacks black
spot at dorsal-fin origin; teeth on roof of mouth
in 4 separate patches (2 vomerine and 3 palatine patches);
maxillary barbel reaches tip of pectoral fin. Habitat:
Spends the dry season in deep pool refuge habitats
in the Mekong mainstream, and possibly some of the
larger tributaries. Three populations of this species
exist, the first in Thakhek, Khammouan province of
the Lao PDR to Chiang Saen, in Chiang Rai province
of Thailand. Second in Khemmaratch, Ubon Ratchathani
province of Thailand in the north, down to Kratie
province in Cambodia. The third population overlaps
the second and is distributed from Stung Treng in
Cambodia, down to the Bassac River in Can Tho province
and to the Mekong Delta. Diet: larvae
and juveniles feed in floodplain habitats, e.g. in
Southern Cambodia and Viet Nam. Adults feed mainly
in large rivers near the surface, often relying on
vision to capture their prey, which include dragonflies.
Reproduction: spawns in large schools
in the Mekong mainstream during the flood season,
possibly later than most other pangasiid species.
Both juveniles and adults enter floodplain habitats
to feed. At the beginning of the dry season, they
move back to the river channels and migrate towards
their dry-season habitats associated with deep pools.
Mekong and Chao Phraya River basins, Java, and Borneo.
Type locality: Banjermassing, in
Poulsen, A.F., K.G.
Hortle, J. Valbo-Jorgensen, S. Chan, C.K.Chhuon, S.
Viravong, K. Bouakhamvongsa, U. Suntornratana, N.
Yoorong, T.T. Nguyen and B.Q. Tran.
2004. Distribution and Ecology of Some Important Riverine
Fish Species of the Mekong River Basin. MRC Technical
Paper No. 10. ISSN: 1683-1489. Ferraris, C.J. Jr., 2007. Checklist
of catfishes, recent and fossil (Osteichthyes: Siluriformes),
and catalogue of siluriform primary types. Zootaxa
1418:1-628. Rainboth, W.J. 1996 Fishes of the
Cambodian Mekong. FAO Species Identification Field
Guide for Fishery Purposes. FAO, Rome, 265 p. Ng, H.H. pers.comm.