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Ompok
bimaculatus (Bloch, 1794)
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| Image
contributors to this species: |
| Johnny
Jensen's Photographic Library
(2)
amiidae
(1) Jean-Francois
Helias
(3)
Beta
Mahatvaraj
(5)
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| ScotCat
Sources: |
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| Other
Sources: |
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| Relevant
Information: |
The genus is recognized
to be paraphyletic. The species of Ompok have been grouped into
species groups, such as the Ompok bimaculatus group
(ie. O. bimaculatus, O. malabaricus,
O. miostomus), the O. eugeneiatus group (ie. O.
eugeneiatus, O. pinnatus), the O. hypophthalmus
group (ie. 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. According to the recent catfish
checklist, O.eugeneiatus has been reclassified into
Kryptopterus, however O. pinnatus has not.
Dorsal soft rays (total): 4 - 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.. Colour: Brown,
usually marmorated body with conspicuous round black blotch
above pectoral base. Habitat: Occurs in streams
and rivers of all sizes with currents ranging from sluggish
to moderate. Found in quiet, shallow (0.5-1.5 m), often muddy
water, in sandy streams, rivers and tanks. Also occurs
in canals, beels and inundated fields. Moves into freshly inundated
habitats during the flood season. Feeds on vegetable matter,
fish, crustaceans and mollusks. Sold fresh or smoked on skewers.
Remarks: The 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. However, given the weak support for the monophyly
of his clades and the difficulty in identifying synapomorphies
to easily diagnose genera, there has been little change in the
taxonomy of this group. The specimens from Malaysia may be another
species, namely O.siluroides, which is currently a
synonym of O.bimaculatus.
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| Common
Name: |
Two-spot
Glass Catfish, Glass Catfish, Butter Catfish |
| Synonyms: |
Silurus bimaculatus,
Callichrous bimaculatus, Pseudosilurus bimaculatus,
Phalacronotus siluroides, Ompok siluroides, Ompok canio, Silurus
canio, Schilbe pabo, Silurus chechra, Silurus duda, Callichrus
affinis, Callichrus immaculatus, Callichrus nebulosus, Wallago
microcephalus, Silurus mysoricus, Silurus indicus, Callichrous
gangeticus, Callichrous macrophthalmus, Callichrous sindensis,
Wallago miostoma, Ompok sindensis |
| Family: |
Siluridaeycipitidae |
| Distribution: |
Asia:
Afghanistan to China, Thailand and Borneo. Endangered status in
the Western Ghats, India |
| Size:
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45cm.
(18ins) |
| Temp: |
20-26°C
(67-79°F) |
| p.H. |
6.0-8.0. |
| Reference: |
Ng; Heok Hee.,
2008, Ompok supernus, a new catfish (Teleostei: Siluridae) from
Borneo. Zootaxa 1877: 59–68 (2008)
Pethiyagoda, R., 1991. Freshwater fishes of Sri
Lanka. The Wildlife Heritage Trust of Sri Lanka, Colombo. 362
p. |
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