Karyological analysis of endangered Caspian salmon, Salmo trutta caspius (Kessler, 1877) |
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| Authors: | Mohammad Reza Kalbassi Salar Dorafshan Tahereh Tavakolian Mahmoud Khazab & Hosein Abdolhay |
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| Institution: | Department of Fisheries, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Mazandaran, Iran; Razi Institute of Serum and Vaccines, Tehran, Iran; Department of Culture and Breeding of Aquatics, Iranian Fisheries Organization, Tehran, Iran |
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| Abstract: | The karyotype and chromosomal characteristics of endangered Caspian salmon, Salmo trutta caspius, in the southern part of the Caspian Sea were investigated. From the total of 60 mitotic metaphases achieved from 15 individuals, 15, 9 and 36 metaphases were with the mode <76, 76 and 80 representing 25%, 15% and 60% of metaphases respectively. So, the most common pattern of chromosome number was 80 (36 metaphases, 60%) and the number of diploid chromosomes was thus confirmed as (2n=80) of this subspecies. The karyotype consists of seven metacentric, five submetacentric and 28 telocentric pairs. The karyological parameters of the Caspian salmon, the centromic index, arm ratio, relative length and length variation range of chromosomes, were 0–0.5, 1–∞, 0.011–0.045 and 0.507–2.028 μm respectively. The total length of chromosomes in haploid series was 44.776 μm and fundamental number of chromosome arms was 104. This study may provide the first knowledge on chromosome analysis in Caspian salmon and add basic information useful for its chromosomal manipulations. |
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| Keywords: | Salmo trutta caspius karyotype chromosome |
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