| General information |
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Ompok bimaculatus (Bloch, 1794) |
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| Common name | Butter catfish |
| Synonyms |
Silurus bimaculatus Bloch, 1794 Callichrous bimaculatus (Bloch, 1794) Pseudosilurus bimaculatus (Bloch, 1794) Wallago bimaculatus (Bloch, 1794) Ompak bimaculatus (Bloch, 1794) Silurus chechra Hamilton, 1822 Callichrous chechra (Hamilton, 1822) Silurus duda Hamilton, 1822 Silurus affinis Swainson, 1839 Callichrus affinis Swainson, 1839 |
| IUCN Red List status (2014) |
Near Threatened (NT) |
| Habitat |
Freshwater |
| Systematics |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Actinopterygii; Neopterygii; Teleostei; Ostariophysi; Siluriformes; Siluridae. |
| Geographical distribution |
India; Bangladesh; Sri Lanka; Pakistan; Myanmar; Nepal; Afghanistan |
| Occurrence |
native: India; native: Bangladesh; native: Sri Lanka; native: Pakistan; native: Myanmar; native: Nepal; native: Afghanistan |
| Importance |
Food/ornamental |
| Karyological information |
| Record 1 |
| Geographical area of study |
Not reported |
| Source of chromosomes |
Kidney |
| Number of specimens with sex |
25 |
| Diploid chromosome number |
42 |
| Karyotype formula |
12m+14sm+16st & t |
| Fundamental arm number |
68 |
| Chromosome length |
Not reported |
| Sex chromosome |
Not detected |
| Chromosome staining/banding/FISH |
Nil |
| Reference |
Sharma R (2008). Chromosomal Studies on Ompak bimaculatus (Bloch) and Ompak pabda (Hamilton Buchanan,1822). Indian Journal of Animal Science, 78(2): 234-236. |
| Record 2 |
| Geographical area of study |
River Jumna and its adioining tributaries near Delhi, India |
| Source of chromosomes |
Testicular material |
| Number of specimens with sex |
Not reported |
| Diploid chromosome number |
40 |
| Karyotype formula |
4m+36a |
| Fundamental arm number |
Not reported |
| Chromosome length |
Not reported |
| Sex chromosome |
Not reported |
| Chromosome staining/banding/FISH |
Not reported |
| Reference |
Nayyar RP(1966). Karyotype studies in thirteen species of fishes. Genetica, 37:78-92. |
| Record 3 |
| Geographical area of study |
Chi basin, Maha Sarakham Province, Northeast Thailand |
| Source of chromosomes |
Kidney cells |
| Number of specimens with sex |
10 (05 males;05 females) |
| Diploid chromosome number |
50 |
| Karyotype formula |
14m+20sm+6a+10t |
| Fundamental arm number |
90 |
| Chromosome length |
Not reported |
| Sex chromosome |
Not reported |
| Chromosome staining/banding/FISH |
The region adjacent to telomere of the short arm of submetacentric chromosome pair 4 showed clearly observable NORs |
| Reference |
Gomonteir B, Tanomtong A, Supiwong W, Sikhruadong S, Neeratanaphan L, Sanoamuang L (2012). Standardized karyotype and idiogram of two-spot glass catfish, Ompok bimaculatus (Siluriformes, Siluridae) in Thailand by conventional and Ag-NOR staining techniques. Cytologia, 77(4): 459-464. |
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