All India Coordinated Research Project on the Ecology and Fisheries of Freshwater Reservoirs, Central Inland Fisheries Research Institute, Rihand Dam, Turra, Mirzapur, Uttar Pradesh
*Present address: Brahmaputra Survey Unit, Central Inland Fisheries Research Institute, Natun Sarania, Gauhati, Assam
Post and pre-monsoon soil and water samples representing different sections of Rihand reservoir were studied for physicochemical characteristics. The study revealed that nutrient value of soil was high in post and low in pre-monsoon months. Clay content of soil increased while sand decreased with the depth. Organic carbon gave significant correlation with available N content. Low value of NO3-N and P and high value of NH4-N in pre-monsoon month showed greater consumption of NO3—N and P by plankton and release of NH4-N from soil. Abundance of fish food (plankton) during post and pre-monsoon months (December to April) is closely correlated with the available nutrient value of soil and water which comes through inflow during monsoon season.
Physical properties, soils of reservoir, availability of nutrient, fish food production
