| dc.description.abstract | The genetic aspect of the swordtail fish (Xiphophorus hellerii), a member of the
Poeciliidae family, rarely to known. The fish has a very high market value and can be
produced as an attractive fish farming product. Therefore the study of Karyotipe of
the swordtailfish had been conducted by using description method.10 pairs of fish
samples were gathered from vendors of ornamental fish in the city of Medan. Samples
were brought to the lab and acclimated for 7 days. Colchicine was administered using
a concentration of 0,007% and soaking time of 12 hours. The tissue preparation was
carried out by the solid tissue technique, and stained by using Giemsa staining 5%.
The number, size, and shape of the chromosomes were the three variables that were
evaluated. IdeoKar ver. 1.3 software and Adobe Photoshop CS3 were used to collect
the data. The outcomesof the research demonstrated that the swordtail fish contained
24 pairs of diploid chromosomes (2n=48), the most of which were metacentric
chromosomal types. The biggest figure for the swordtail chromosome's size was found
on chromosome 1, which had a total arm size (CL) of 8,33 µ. The highest chromosome
r-value was 0,97µ, the longest chromosome relative length (RL%) was 7,18 µ, the
greatest chromosomal shape percentage (F%) was 39,601 µ, the largest chromosome
arm ratio (AR) was 1,08 µ, and the largest index value was centromere (CI) 0,49 µ. A
low average centromere index (XCI) was 0,385µ and a large total haploid complement
length (HCL) was 115,900 µ characterize the chromosomal makeup of swordtail fish,
respectively | en_US |
