Study on trophic state index of river mandakini at chitrakoot, India

“Trophic state” is used to classify aquatic ecosystems according to biotic productivity. A trophic state index incorporates a scale of 0 to 100. Each major division (10, 20, 30 etc.) represents a doubling in algal biomass. The index number can be calculated from any of several parameters, including secchi disc transparency, chlorophyll and total phosphorus. This index can be used as a predictive tool in lake management. In the present study the selected reach of River Mandakini was found in different trophic level. It was fond Oligotrophic at S1 site and Mesotrophic at S2, S3, S4& S5 sites respectively. It is indicating that site S2, S3, S4 and S5 needs conservation from being Eutrophic.