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ThesisItem Open Access Limnological profile and ichthyofaunal diversity of Nanaksagar reservoir(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2017-06) Raveendar, Banothu; Sharma, A.P.Present study was conducted to assess the limnological characteristics and ichthyofaunal diversity in Nanaksagar reservoir, located in Tarai region of Uttarakhand. Along with soil and water quality parameters, analysis of phytoplankton, zooplankton and fish communities was done in Nanaksagar reservoir. Monthly samplings were conducted at three selected sites during August 2016 to March 2017. A total number of 24 species of phytoplankton, 14 species of zooplankton and 30 species of fishes were recorded during the study period. Maximum population of phytoplankton (2.31x 105 cells/l) and zooplankton (14.0 x103 individuals/l) occurred in the month of February 2017. The fish data is subjected to species diversity analysis. Among fishes, Gadusia chapra with mean annual contribution of 44.14% was the most dominant fish species in the catches. Labeo gonius with a contribution of 15.95% was another quantitatively dominant species during the study period. Among Indian major carps Cirrhinus mrigala was the most abundant. The Cat fishes and minor carps were also present in appreciable numbers in the fishery of the Nanaksagar reservoir. Maximum and minimum fish catch was obtained in the month of February, 2017 and September, 2016 respectively. As per values of Shannon (2.118 – 2.612) and Simpson diversity (0.822 – 0.8954) indices fish community of the reservoir is diverse. The range of Margalef and Menhinick species richness indices (3.253 – 3.782 and 0.9183 – 1.065, respectively) indicates moderate fish species richness. Fish production was found to be positively correlated with total alkalinity, dissolved oxygen, zooplankton, phytoplankton and pH.