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Subject: Aquaculture × Author: Gururani, Samridhi × End date: 2024 × Type: Thesis × Thesis Type: M.F.Sc ×
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    ThesisItemOpen Access
    Comparative assessment of productivity status in Kumaon lakes
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-12) Gururani, Samridhi; Tiwari, Hema
    The present study was designed to draw a comparative assessment of the productivity status in lakes Bhimtal, Nainital, Naukuchiatal and Sattal of Kumaon region in Uttarakhand. Attempt has been made to assess the current water quality status of the lakes, phytoplankton composition, primary productivity and thereby classifying the trophic status of the lakes on the basis of productivity. Samples were collected fortnightly for a period of six months from November, 2020 to April 2021.The physico-chemical parameters like temperature, transparency, total dissolved solids, electrical conductivity, pH, dissolved oxygen, total alkalinity, total hardness, Nitrate-Nitrogen and Phosphate-Phosphrous were fairly moderate and were found to be within permissible limits. A total of 46 different taxa of phytoplankton belonging to five different classes were recorded from the lakes Bhimtal, Nainital, Naukuchiatal and Sattal during the study period . These different taxa belonged to the classes namely Bacillariophyceae(21), Chlorophyceae(17), Cyanophyceae(5), Euglenophyceae(2) and Dinophyceae(1). Members of Baciillariophyceae were found to be dominant . Phytoplankton density was found to be maximum in Naukuchiatal lake (68722±8002) followed by Sattal lake(65833±8772), Bhimtal lake(64583±1740) and Nainital Lake(60750±11767). In Bhimtal lake values of GPP, NPP and CR were between 13.89 to 18 mgCm-3hr-1, 8 to13.99 mgCm-3hr- 1and 0.01 to 0.39 mgCm-3hr-1. In Nainital lake values of GPP, NPP and CR fluctuated between 12.67- 18.37 mgCm-3hr-1, 11.41- 16.05 mgCm-3hr-1 and 0.02- 0.13 mgCm-3hr-1. In Naukuchiatal lake values of GPP, NPP and CR fluctuated between 14.53- 18.58 mgCm-3hr-1, 12.74- 16.76 mgCm-3hr-1 and 0.015- 0.28 mgCm-3hr-1 whereas in Sattal lake values of GPP, NPP and CR fluctuated between 12.41- 16.14 mgCm-3hr-1, 8.53- 13.47 mgCm-3hr-1and 0.03- 0.22 respectively. Productivity status indicated optimal nutrient availability and uniform energy flow in the food web of the lakes , Naukuchiatal lake was found to be the most productive lake followed by Bhimtal, Nainital and Sattal . On the basis of primary productivity and other important biological indicators like transparency, chlorophyll a concentration and phosphorous content, lakes Bhimtal, Nainital, Naukuchiatal and Sattal depicted moderate mesotrophic conditions during the entire study period. The details of the findings of the investigation is presented in different chapters of the thesis.