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Subject: Aquaculture × Author: Chandra, Bhanu × End date: 2024 × Start date: 2020 × Type: Thesis ×
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    ThesisItemOpen Access
    Comparative assessment of microbial load in Kumaun lakes
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-12) Chandra, Bhanu; Mishra, Ashutosh
    The present study was conducted to made comparative assessment of water quality parameters, microbial load and trophic status of four selected lakes of Kumaun region which is Lake Nainital, Bhimtal, Sattal and Naukuchiatal for a period of six months i.e., Nov, 2020 to April, 2021. Three sampling sites were selected based on level of human interaction namely, S1 (Site of least interaction), S2 (Moderate interaction) and S3 (Maximum interaction) from each lake to analyse the above parameters. Surface water samples were collected fortnightly and certain parameters were analysed at sub-surface layer as well. The average values of physical parameters i.e., surface temperature, subsurface temperature, secchi disc transparency, surface conductivity, subsurface conductivity, surface and subsurface TDS were recorded as13.4°C, 13.2°C, 169.7 cm, 412.9 μS cm-1, 411.8 μS cm-1, 351.5mg L-1, 350.4 mg L-1, respectively in Lake Nainital; 15°C, 14.6°C, 232.9 cm, 157.2 μS cm-1, 156.6 μS cm-1, 127.9 mg L-1, 128.2 mg L-1, respectively in Lake Bhimtal; 16.2°C, 15.6°C, 282.6 cm, 84.8 μS cm-1, 83.2 μS cm-1, 66.3 mg L-1, 65.9 mg L-1, respectively in Lake Sattal and 18.3°C, 17.4°C, 265.9 cm, 139.6 μS cm-1, 138.4 μS cm-1, 104.8 mg L-1, 104.2 mg L-1, respectively in Lake Naukuchital during the period of study. During research period, the average values of chemical parameters which is surface pH, subsurface pH, surface DO, subsurface DO, total alkalinity, total hardness, salinity, nitrate-nitrogen and phosphate were recorded as 8.1, 8.2, 8.24mg L-1, 8.1mg L-1, 158.4mg L-1, 311.0mg L-1, 0.26 psu, 0.109mg L-1, 0.019 mg L-1, respectively in Lake Nainital; 8.2, 8.2, 8.55mg L-1, 8.2mg L-1, 85.2mg L-1, 115.8mg L-1, 0.09 psu, 0.061mg L-1, 0.020 mg L-1, respectively in Lake Bhimtal; 7.9, 7.8, 6.67mg L-1, 6.3mg L-1, 58.6mg L-1, 76.3mg L-1, 0.05psu, 0.072mg L-1, 0.014 mg L-1, respectively in Lake Sattal and 8, 8.1, 9.5mg L-1, 9.2mg L-1, 73.6mg L-1, 110.9mg L-1, 0.08 psu, 0.063mg L-1, 0.017mg L-1, respectively in Lake Naukuchital. The average bacterial load was recorded as 1.174, 1.208, 0.845 and 0.883 CFU×106 ml-1 in Lake Nainital, Bhimtal, Sattal and Naukuchiatal, respectively. The dominant bacterial isolates were identified as Micrococcus, Bacillus, Flavobacterium and Pseudomonas. Based onlimnological parameters and bacterial count, Lake Nainital and Bhimtal were identified as highly Mesotrophic whereas Lake Sattal and Naukuchital were identified as fairly Mesotrophic.