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ThesisItem Open Access Assessment of fisheries potential using geospatial technology in selected reservoirs of Tarai region of Uttarakhand(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2016-01) Ingole, Nandkishor Atmaram; Ram, R.N.Present study deals with application of geospatial technology for discrimination of different physico-chemical parameters, seasonal variation of plankton, present status of fish fauna, demarcation of productive zone and site suitability for culture practices of selected reservoirs (Nanak Sagar and Tumaria) in Tarai region of Uttarakhand. Both the reservoirs are having different catchment area and environmental conditions. Study was conducted for a period of 12 months (seasonal variation) from July, 2014 to June, 2015. Each time twenty sampling points of same coordinates (every time) were selected with the help of GPS. The physico-chemical parameters of water and soil were analyzed from selected reservoirs and annual range of these parameters was worked out. It showed less variation in Nanak Sagar as compared to Tumaria reservoir that may be due to presence and absence of floating weed Salvinia. Seasonal variation of phytoplankton showed that more number of species are found in Nanak Sagar (28) than Tumaria reservoir (23). Annual range of phytoplankton varied from 69253-113904 no/l and 65229-136941 no/l in Nanak Sagar and Tumaria reservoir, respectively. The qualitative and quantitative analysis of phytoplankton showed presence of 39% species of Chlorophyceae, 36% species of Bacillariophyceae and 25% species of Cyanophyceae in Nanak Sagar and 39%, 35% and & 26% in Tumaria reservoir. The total zooplankton variation 1977-2779 no/l of 19 and 1895-3479 no/l of 18 species in Nanak Sagar and Tumaria reservoir, respectively. Five species of Cladocera and Copepod each have been found in both reservoirs, whereas 9 species of Rotifer group has been recorded in Nanak Sagar and 8 species are in Tumaria reservoir. The thematic maps of annual distribution of each water and soil parameters and seasonal variation of planktons were also created. Total annual catch of 274225 Kg and 64808 Kg were estimated in year 2014-15 from Nanak Sagar and Tumaria reservoir, respectively. It is concluded that average fish production (124.60 kg/ha) of Nanak Sagar was more than average production (40 kg/ha) of Tumaria reservoir, mainly because of lesser productive water and Salvinia infestation in Tumaria reservoir. GIS technique has been used to demarcate the productive zone in the selected reservoirs. The results indicate that high productive zone 15.34% area in Nanak Sagar and 10.19% area in Tumaria reservoir. The suitable sites for cage culture were also identified which were approximately 40.90% in Nanak Sagar and 43.18% in Tumaria reservoir. Using GIS technique 15.34% and 10.19% area out of total area were classified as highly suitable for pen culture system in Nanak Sagar and Tumaria reservoir, respectively. Spectral model of hydrological parameters and phytoplankton biomass of both reservoirs were also prepared. Accuracy assessment based on predictive and observed value was carried out on the basis of co-efficient of determination (R2). The higher accuracy in all spectral models of water quality parameters and phytoplankton biomass of Nanak Sagar as compared to Tumaria reservoir might be due to Salvinia infestation in Tumaria reservoir. Results of this study are promising and can be used to conclude that selected reservoirs have immense fisheries potential. It is recommended that the geospatial technologies may be used to study the future impact of human interventions.