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ThesisItem Open Access Relative variability in phenotypic and genotypic characteristics of golden Mahseer (Tor putitora) stocks of different habitats(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Pant, Bonika; Ram, R.N.Uttarakhand state is blessed with numbers of water bodies swirling and rumbling along the rugged mountains which harbour Golden mahseer, one of the 20 mega fishes of the world, an elusive and intelligent large cyprinid and the toughest among the fresh water sport fishes. In this milieu, the present study investigated the patterns of phenotypic and genotypic variations of Tor putitora in different habitats. The sampling sites included four lentic and lotic water bodies of the hilly state Uttarakhand and one captive stock of the target fish i.e. River Kosi, River Saryu, Lake Bhimtal, Nanak Sagar Reservoir and captive stock of DCFR Farm, Bhimtal. Biometrics revealed that River Kosi showed isometric growth (isomeric, b = 3.013) and the condition factor was highest in River Saryu (K=1.65) Phenotypic study was performed using Truss Measurement Network (TMN) of 14 landmarks making 31 characters which reported high degree of significant morphometric heterogeneity among the populations with size within landmarks and shape as major factors of divergence in lotic and lentic systems respectively. Between-groups Principal Component Analysis revealed that the first and second principal components accounted for 87.7 and 6.7% of variance respectively. All the 31 truss variables loaded heavily in the first factor. 91.8% of individuals were correctly classified in each original group for morphometric measurements of T.putitora. Morphometry of lentic, lotic and farmed systems formed separate clusters supporting the fact that environment plays a vital role in shaping the phenotypic characters. The study deciphered that Golden mahseer exhibits phenotype plasticity and truss measurement network has the potential to provide an alternative tool for the stock characterization. Genotypic study revealed lotic ecosystems have higher genetic diversity than lentic ecosystems. Microsatellite assay analysed 14% of molecular variance among populations, 3% of difference within populations and 83% of molecular variance within individuals. The study spells out the felicitousness of microsatellite markers as a simple, reliable and distinguished molecular tool for the diagnosis of genetic distinction. Studies of patterns of morphometric and genetic variations are complimentary and this knowledge is vital to ensure conservation and management of Golden mahseer.