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Johnny Jensen's  Photographic Library (2) Ben Lee (1) Jean-Francois Helias (2) Beta Mahatvaraj (2)

Description: Dorsal soft rays (total): 4; Anal soft rays: 54 - 74. Two pairs of barbels; maxillary barbels reaching pelvic fins or anal fins; mandibulary barbels minute, about as long as diameter of eye. Eyes small, covered by skin. Dorsal and pelvic fins small; anal fin long; pectoral fins well developed vomerine teeth in 2 patches. Brown, usually marmorated body with conspicuous round black blotch above pectoral base and a smaller sometimes indistinct spot at the caudal peduncle. The genus is recognized to be paraphyletic. The species of Ompok have been grouped into species groups, such as the Ompok bimaculatus group (O. bimaculatus, O. malabaricus, O. miostomus, O. siluroides), the O. eugeneiatus group (O. eugeneiatus, O. pinnatus), the O. hypophthalmus group (O. hypopthalmus, O. rhabdinurus, O. urbaini), and the  O. leiacanthus group (O. fumidus, O. jaynei, O. leiacanthus). On the other hand, the monophyly of these species groups is not strong enough to reassign species to other genera. The O. eugeneiatus group is likely to be more closely related to Kryptopterus than the other Ompok species. Habitat: Occurs in streams and rivers of all sizes with currents ranging from sluggish to moderate. Diet: Moves into freshly inundated habitats during the flood season and feeds on crustaceans and mollusks. Etymology: –oides, having the form of: Silurus, a related genus from Europe, but in this case perhaps referring to catfishes in general. Remarks: This species was at one time a synonym for O. bimaculatus but this species has a silver body.

None

Phalacronotus siluroides, Wallago krattensis, Ompok krattensis.

Siluridae

Asia: Mekong and Chao Phraya River drainages in Indochina, the Malay Peninsula, the Barito River drainage in southern Borneo and Java.

21.5cm. (8½ins)

20-26°C (67-79°F)

6.0-8.0.

Froese, R. and D. Pauly. Editors. 2014. FishBase.World Wide Web electronic publication. www.fishbase.org, ( 11/2014 ).
Kottelat, M., 2001. Fishes of Laos. WHT Publications Ltd., Colombo 5, Sri Lanka. 198 p.
Rainboth, W.J., 1996. Fishes of the Cambodian Mekong. FAO Species Identification Field Guide for Fishery Purposes. FAO, Rome, 265 p.