Length–weight, length–length relationships and feeding habits of wild Indus Mahseer, Tor macrolepis, from Attock, Pakistan

Summary In this study the length–weight (LWR) and length–length relationships (LLR) were carried out for Indus Mahseer, Tor macrolepis, from the Haro River and Nalah Kala, Attock, Pakistan. A total of 118 specimens were used to estimate the relationship parameters. The results of LWR (W  =  a TLb) from five different sites indicated W = 0.0044 TL3.14, W = 0.0054 TL3.08, W = 0.0059 TL3.21, W = 0.0076 TL3.12, and W = 0.0107 TL2.99, respectively, with an overall value of W = 0.0100 TL2.94. All regressions for LLR were highly significant (P ≤ 0.001), with coefficient of determination (r2) values of > 0.90. All relationships for LWR and LLR were found to be isometric. T. macrolepis is principally a herbivorous bottom feeder, mainly feeding on aquatic plants and algae, supplemented by insects.