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Cytogenetic studies in Astyanax fasciatus karyotype composition and location of the 5S and 18S rDNA in the chromosomes of the individuals analyzed.
| Cytotypes 2n / NF | Number of specimens | Chromosome | rDNA 18S/5S | Number of B Chromosomes | NOR | |
|---|---|---|---|---|---|---|
| Female Male | Formulae | location (pairs) | females | males | (pairs) | |
| 2n = 46, NF=84 | 12 10 | 5m+8sm+6st+4a | 8,15,16,20,21, B/3,20 | 1 | 1 | 9,10 |
| 2n = 48, NF=86 | 10 9 | 5m+8sm+6st+5a | 8,12,19,20,21/3,20 | 0 | 0 | 9,10 |
| 2n = 50, NF=84 | 41 32 | 5m+8sm+4st+8a | 5,8,12,18,22/3,21 | 0 | 0 | 9,10 |
