Mapping of high-altitudinal lakes for coldwater fisheries development in Tawang district of Arunachal Pradesh using geospatial technology
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Date
2021-02
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The incorporation of geospatial technology with multi criteria decision-making method using Analytical Hierarchy Process (AHP) in this study has made it possible for the identification of the potential sites in the selected lakes for the development of coldwater fisheries in the district of Tawang, Arunachal Pradesh. The highly suitable areas of 6.24 ha (33.50 %), 1.14 ha (33.26 %), 2.19 ha (26.89 %), 0.27 ha (29.99 %) and 1.58 ha (16.90 %); moderately suitable areas of 1.45 ha (7.76 %), 0.63 ha (18.53 %), 5.61 ha (68.95 %), 0.40 ha (44.02 %) and 2.18 ha (23.27 %) were recorded for Sela, Nagula, Panga Teng Tso, an un-named lake and Sangestar, respectively. The physico-chemical parameters ,i.e., temperature ( 4.9±0.05°C to 8.2±0.05°C), electrical conductivity (3.1±0.00 μS/cm to 52.35±2.35 μS/cm), total dissolved solids (2.0±0.0 mg/L to 33.5±1.5 mg/L), dissolved oxygen (6.77±0.010 mg/L to 8.33±0.100 mg/L), carbon dioxide (2.00±0.000 mg/L to 2.50±0.09 mg/L), pH (6.7±0.15 to 7.9±0.05), phosphate (0.010±0.000 mg/L to 0.270±0.010 mg/L), nitrite (0.003±0.000 mg/L to 0.0085±0.0005 mg/L), iron (0.07±0.020 mg/L to 0.265±0.015 mg/L) and ammonium (0.010±0.000 mg/L to 0.020±0.001mg/L) were found to be quite conducive for coldwater fisheries development in the selected lake resources. The biological parameters, i.e., phytoplankton and zooplankton numbers were comparatively greater in the highly and moderately suitable areas than that in the unsuitable areas of the lakes. However, 10.94 ha (58.73 %), 1.65 ha (48.21 %), 0.34 ha (4.15 %), 0.24 ha (25.99 %) and 5.60 ha (59.83 %) were accounted as the unsuitable areas in Sela, Nagula, Panga Teng Tso, un-named lake and Sangestar lakes, respectively which are, therefore, deemed inapt for any fisheries development. Overall, it was found that coldwater and sports fisheries development can be taken up in the selected lake resources of the district.