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Karyotype of a Bagrid catfish, Mystus vittatus, from the freshwater system of Chidambaram, Tamil Nadu, India

机译:来自印度泰米尔纳德邦奇丹巴拉姆淡水系统的Bagrid鲶鱼mystus vittatus的核型

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摘要

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.
机译:通过检查from组织的中期染色体扩散,研究了奇丹巴拉姆淡水系统中的Mystus vittatus(Bagridae)的核力学特征。对由25个鱼种标本制备的149个中期扩散进行的检查表明,该物种的染色体数为2n = 54,其中亚中心位的臂数为12,亚中心位的臂数为36,亚中心位型的臂数为30。该物种准备的核型由3对亚中心(m),9对亚亚中心(sm)和15对近中心(a)染色体组成。染色体公式可以表示为2n = 3m + 9sm + 15a。这种核型与其他人报道的相同物种有显着差异。核学参数表明,该鱼类的染色体的离心指数,臂长比,相对长度和染色体长度变化范围分别在14.97-50.00、1.00-5.68、3.12-18.48和0.60-3.56之间。该物种中最大的染色体是一对亚中心染色体。考虑到染色体的数量,vittatus似乎是二倍体起源的鱼类。

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