Cat-eLog Right Arrow Siluridae Right Arrow Ompok

Jump to next section Cat-eLog Data Sheet
Scientific NameOmpok bimaculatus  (Bloch, 1794)
Common NamesTwo Spot Glass Catfish
Toplettet Glasmalle (Denmark)
Type LocalityTranquebar (now Tarangambadi, Tamil Nadu)
Synonym(s)Callichrous bimaculatus, Callichrous chechra, Callichrous gangeticus, Callichrous macrophthalmus, Callichrus affinis, Callichrus nebulosus, Ompok siluroides, Phalacronotus siluroides, Pseudosilurus bimaculatus, Silurus bimaculatus, Silurus chechra, Silurus duda, Silurus microcephalus, Silurus mysoricus, Wallago microcephalus
PronunciationAwm pok
EtymologyThe etymology of Ompok is unclear. It is believed to be a corruption of the Indonesian name for mid-sized silurid catfishes, limpok. The specific epithet comes from the Latin bis meaning two, and macula, meaning spot; in reference to the presence of two dark spots in this species.
Jump to next section Species Information
Size 450mm or 17.7" SL. Find near, nearer or same sized spp.
IdentificationThe catfish genus Ompok La Cepède, 1803, consists of medium-sized silurid fishes found in inland waters throughout South and Southeast Asia. The genus is traditionally diagnosed by the presence of a short dorsal fin with 4 rays, strongly forked caudal fin, subcutaneous eye that is set immediately posterior to the mouth rictus and two patches of palatal teeth (Weber & de Beaufort, 1913). Bornbusch (1995) showed that Ompok, as currently understood, is probably paraphyletic.

The two spots are found above and behind the pectoral-fin base and the other at the base of the caudal peduncle. The fish often idebntified as O. bimaculatus (and most commonly encountered in the aquarium trade) is a Southeast Asian species, Ompok siluroides which has a rounder head and a mottled brown colouration, while O. bimaculatus are silvery and have a sharper head.
SexingMales are more slender and have strong serrations on the posterior edge of the pectoral spine (females lack these serrations).
Jump to next section Habitat Information
DistributionIndian subcontinent.
Thailand Waters (click on these areas to find other species found there)
Cambodia waters (click on these areas to find other species found there)
Pacific, Malaysia Waters (click on these areas to find other species found there)
Indian waters (click on these areas to find other species found there)
Bangladesh Waters (click on these areas to find other species found there)
Pacific, Greater Sunda Island Rivers, Borneo Waters (click on these areas to find other species found there)
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IUCN Red List StatusNear Threatened
pH6.4 - 7.4
Temperature20.0-26.0°C or 68-78.8°F (Show species within this range)
Jump to next section Husbandry Information
FeedingReadily feeds on live/frozen foods and other prepared foods such as pellets. Will also eat small fishes/shrimps.
FurnitureProvide plenty of hiding spaces in the form of driftwood or PVC pipes. Prefers an area of open water when active. Current preferred.
CompatibilityA relatively peaceful species that is compatible with most fish of equal size or larger. Not safe with small fishes.
BreedingNot known in the aquarium. Has been bred using hormone injections in India.
Jump to next section Further Information
ReferencesNaturg. Ausl. Fischev. 8 - pp24 - Pl. 364
Jayaram, KC. 2006. The Catfishes of India. Narendera Pub. House. 383 pp.
Jayaram, KC, 1977. Year of publication and type-locality of Ompok bimaculatus (Bloch) (Pisces: Siluroidea). Newsletter of the Zoological Survey of India, 3: 50-51.
Burgess, W.E. 1989. An Atlas of Freshwater and Marine Catfishes; A Preliminary Survey of the Siluriformes. TFH. 784pp.
Registered Keepers(1) Silurus, (2) straitjacketstar (k: 4), (3) yellowcat, who also notes: "No longer kept...", (4) Attu, (5) Jeox, (6) Koltsix, (7) Ebisu, (8) miles44 (k: 4), (9) Shovelnose, (10) SoCalDiscus.

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Breeding ReportsNone.
Article - CotM 2005 November
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Last Update2014 Jan 19 04:40 (species record created: 2005 Apr 17 00:00)