Short reports
ScienceAsia (): 157-160 |doi:
10.2306/scienceasia1513-1874...157
Karyotype of a Bagrid catfish, Mystus vittatus, from the freshwater system of Chidambaram, Tamil Nadu, India
Ramasamy Karuppasamya, Bela Zutshib, Kamatchi Bhavanib
ABSTRACT: Karyological characters of Mystus vittatus (Bagridae) in the freshwater system of Chidambaram were studied by examining metaphase chromosome spreads from the gill tissues. The examination of 149 metaphase spreads prepared from 25 fingerling specimens indicated that the chromosome number of this species was 2n=54 and the arm number was 12 for metacentric, 36 for submetacentric, and 30 for acrocentric type. The prepared karyotypes of this species consisted of 3 pairs of metacentric (m), 9 pairs of submetacentric (sm) and 15 pairs of acrocentric (a) chromosomes. The chromosome formula can be represented as 2n = 3m + 9sm + 15a. This karyotype is significantly different from same species reported by others. Karyological parameters showed that centrometric index, arm ratio, relative length, and length variation range of chromosome of this fish species are between 14.97–50.00, 1.00–5.68, 3.12–18.48, and 0.60–3.56, respectively. The largest chromosome in this species is a pair of submetacentric chromosomes. Considering the number of chromosomes, it seems likely that M. vittatus, is a diploid origin fish.
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Aquatic Biology and Fish Toxicology, Department of Zoology, Annamalai University, Annamalainagar, Tamil Nadu 608 002, India |
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Aquatic Biology and Fish Toxicology Section, Department of Zoology, Bangalore University, Bangalore 560 056, India |
* Corresponding author, E-mail: rk_smy@yahoo.com
Received 1 Dec 2009, Accepted 20 May 2010
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