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Subject: Aquaculture × Author: Sumit Kumar × Start date: 2015 × Type: Thesis ×
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    ThesisItemOpen Access
    Observations on zooplankton community of Nanak Sagar Reservoir, Uttarakhand
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2017-06) Sumit Kumar; Trakroo, M. Das
    Nanak Sagar is an important reservoir situated in Sitarganj, district Udham Singh Nagar on the bank of Deoha stream. The zooplankton density and diversity along with important physico-chemical parameters were studied on forthnightly basis during the period of eight months from August, 2016 to March, 2017. Three sampling sites of the Nanak Sagar reservoir i.e. (A1, A2 & A3) were selected according to human intervention for regular sampling of zooplankton and water. Site A1 is the Baoli Sahib, the second site is A2 which is known as Kati pulia which is about .92 kilometers from site A1 and has a steady environment. The third site was the Dam area which is about 1.63 kilometers from site A2 and 2.5 kilometers from site A1. The range of physico-chemical parameters i.e. water temperature, dissolved O2, free CO2, transparency, pH, conductivity, total dissolved solids, total alkalinity, NO3-N and PO4-P during the study period were 16.9 to 34 0C, 3.2 to 9.6 mgL-1, 0 to 6 mgL-1,67.9 to 194 cm, 7 to 8.7, 118 to 336 μS cm-1, 91.7 to 156 mgL-1, 60 to 140 mgL-1, 0.22 to 0.64 mgL-1 and 0.043 to 0.2 mgL-1 respectively. The zooplankton mainly consists of Rotifera, Copepoda, Cladocera, Ostracoda and Diptera, Out of 24 genera, 10 were from rotifera, 6 from cladocera, 5 from copepoda, 2 from ostracoda and 1 belonged to diptera group. The observed zooplankton ranking was in order of: Rotifers > Copepods > Cladocerans > Ostracods > Dipterans. The average density of zooplankton was 6250 ind. L-1, 4125 ind. L-1 and 4000 ind. L-1 at site A1, A2 and A3 respectively. Rotifers constituted a significant component (37.93 %) followed by copepods (35.81 %); cladocerans (31.06 %); ostracods (1.43 %) and dipterans (0.62 %). Diversity of zooplankton shown their own maximum and minimum abundance during a particular season. Zooplankton diversity was high at site A2 as compared to site A1 & A3 throughout the study because of stable environment and less human intervention. The water quality parameters of Nanak Sagar reservoir reveals that the environmental conditions are good from fisheries point of view .