General information |
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| Arapaima gigas (Schinz, 1822) | ||
| Common name | Arapaima | |
| Synonyms |
- |
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| IUCN Red List status (2014) | Data Deficient (DD) |
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| Habitat | Freshwater |
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| Systematics |
- |
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| Geographical distribution | Thailand; Brazil; Colombia; Peru; Ecuador; Guyana |
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| Occurrence | Introduced: Thailand Native: Brazil, Colombia, Peru, Ecuador Questionable: Guyana |
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| Importance | ||
| Remarks | FISH with 5S rDNA probe shows signals interstitially on q arms of chromosome pair 1. 18S rDNA probe identified single locus with intense signal located in proximal p arm of pair 2 which corresponds to Ag-NOR site. |
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Karyological information |
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| Geographical area of study | Tocantins River basin, South America. | |
| Source of chromosomes | Spleen |
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| Number of specimens with sex | 15 (8 male and 7 females) |
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| Diploid chromosome number | 56 |
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| Karyotype formula | 28m to sm+28st to a |
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| Fundamental arm number | 84 |
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| Chromosome length | - |
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| Sex chromosome | No sex-related heteromorphisms detected. |
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| Chromosome staining/banding/FISH | C-positive bands found preferentially in centromeric/pericentromeric regions of all chromosomes. Conspicuous terminal and interstitial C-bands observed in pairs 1, 2, 4, 6, 7, 9, 10, 21, and 22. C-bands on pairs 2 corresponds to Ag-NOR location. Multiple CMA3-positive bands detected in genomes, particularly nearby the telomeric region of seven chromosome pairs (2, 3, 4, 15, 16, 24, 26), in addition to Ag-NOR sites. |
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| Reference(s) |
de Oliveira EA, Bertollo LAC, Rab P, Ezaz T, Yano CF, Hatanaka T, et al. (2019) Cytogenetics, genomics and biodiversity of the South American and African Arapaimidae fish family (Teleostei, Osteoglossiformes). PLoS ONE 14(3): e0214225. |
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