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Title: A Study of Morphology, Distribution and Phylogenetics of Mahseer in Pakistan
Authors: Yousaf, Mohammad
Keywords: Biological & Medical Sciences
Issue Date: 2021
Publisher: University of Peshawar, Peshawar.
Abstract: In South and South East Asia three genera of fish species i.e. Tor, Neolissochilus and Naziritor are commonly known as Mahseer with at least 46 species. Among these 23 belongs to genus Tor, 22 to genus Neolissochilus and one to genus Naziritor i.e. Naziritor zhobensis. Recently another species added to genus Naziritor is Naziritor chelynoides in India. Among Tor species Tor putitora (Hamilton) is the most widely distributed Mahseer in Pakistan and other countries of Indian subcontinent. However, based alone on morphological characters some authors identify the Pakistani counterparts as Tor macrolepis (Heckel), (a species presumed to be found exclusively in Indus river system) distinct from Tor putitora (a species found in Ganga Brahmaputra river system). In order to resolve these taxonomic ambiguities the present study carried out Meristic counts and morphometric measurements of Mahseer collected from a total of 11 water bodies of Pakistan i.e. River Panjkora, River Swat, streams of Skhakot, River Barandu, Tarbela Dam Reservoir of River Indus, Mangla dam Rerservoir of River Jehlum, River Chenab, Gomal Zam Dam and its tributaries in North Wazairistan, Tank and River Zhob of the Indus riverine system of Pakistan. Ratios between the morphometric characters were calculated and statistically analyzed using t-test and correlation coefficient. Two species identified as Tor putitora and Naziritor zhobensis were the sole Mahseer inhabitants of Indus and allies in Pakistan. Tor putitora ocured at all surveyed sites while Nazirtor zhobensis had a distribution range from river Zhob to tributaries of river Gomal. The study corroborates that there are no unequivocal morphological synapomorphies in any existing populations of both species. The study further demonstrates that head length a character frequently used in Mahseer taxonomy is not a good measure for species identification. Phylogenetic analyses using CO1, 16srRNA, Cyt b and ATPase 6/8 gene have also revealed that the Tor occurring in the water bodies of Pakistan is genetically similar to Tor putitora. This analysis has clustered Naziritor zhobensis with the other species of Naziritor confirming its placement in the genus. It has also been observed that Naziritor is genetically closer to Mahseer i.e. Tor and Neolissochilus than to other cyprinids. Among the four genes Cyt b and ATPase6/8 gene demonstrate a better inferring of the phylogenetic relationship among the three groups or genera of Mahseer i.e. Tor, Neolissochilus and Naziritor. Present study concludes the presence of two mahseer species in Pakistan i.e. Tor putitora and Naziritor zhobensis and that Tor macrolepis may be treated as junior synonym of Tor putitora. Naziritor zhobensis rightly belongs to genus Naziritor and it is genetically close to other Mahseer. Finally the present study establishes that Naziritor zhobensis still exists in the water bodies of Pakistan and that golden Mahseer occurring in Indus riverine system of Pakistan is Tor putitora.
Gov't Doc #: 24148
Appears in Collections:PhD Thesis of All Public / Private Sector Universities / DAIs.

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