Kunal Swaraj Priyaranjan, Kumar Girish
Biological Oceanography Division, National Institute of Oceanography, Dona Paula, Goa 403 004, India.
Int J Bioinform Res Appl. 2013;9(3):301-9. doi: 10.1504/IJBRA.2013.053613.
Tunas are commercially important fishery worldwide. There are at least 13 species of tuna belonging to three genera, out of which genus Thunnus has maximum eight species. On the basis of their availability, they can be characterised as oceanic such as Thunnus albacares (yellowfin tuna) or coastal such as Thunnus tonggol (longtail tuna). Although these two are different species, morphological differentiation can only be seen in mature individuals, hence misidentification may result in erroneous data set, which ultimately affect conservation strategies. The mitochondrial DNA cytochrome oxidase c subunit 1 (COI) gene is one of the most popular markers for population genetic and phylogeographic studies across the animal kingdom. The present study aims to study the sequence conservation and variation in mitochondrial Cytochrome Oxidase I (COI) between these two species of tuna. COI sequence analysis of yellowfin and longtail revealed the close relationship between them in Thunnus genera. The present study is the first direct comparison of mitochondrial COI sequences of these two tuna species.
金枪鱼在全球商业渔业中具有重要地位。金枪鱼至少有13种，分属于三个属，其中金枪鱼属最多有8种。根据其分布情况，它们可分为大洋性的，如黄鳍金枪鱼（Thunnus albacares），或沿岸性的，如长鳍金枪鱼（Thunnus tonggol）。虽然这两种是不同的物种，但形态差异仅在成熟个体中可见，因此误认可能导致错误的数据集，最终影响保护策略。线粒体DNA细胞色素氧化酶c亚基1（COI）基因是动物界种群遗传学和系统地理学研究中最常用的标记之一。本研究旨在研究这两种金枪鱼线粒体细胞色素氧化酶I（COI）的序列保守性和变异性。黄鳍金枪鱼和长鳍金枪鱼的COI序列分析揭示了它们在金枪鱼属中的密切关系。本研究是这两种金枪鱼线粒体COI序列的首次直接比较。
