Evaluation of water quality and dam for sustaining the fish population dynamics

Abstract Bhagirathi is a Himalayan River, which flows in Uttrakashi district Uttarakhand state. It one of the most important streams Ganga River. This river famous for dam construction and fisheries development. The fishes commercial importance cold water are Mahaseer, Snow Trout. fish production depends on physical, chemical as well biological qualities water. In present paper, quality evaluation sustaining population dynamics have been reviewed to make aware culturist environmentalist about factors influence health pond increase yields meet growing demands time scenario our country. dams causes many problems. Water discharge from wall systems also indirectly affect populations. this study, we review some impacts associated with their recommended mitigation measures. There negative impact dynamics, especially downstream habits due dams. measured like temperature, turbidity, carbon dioxide, pH, alkalinity, hardness, BOD, TDS, Turbidity. maximum oxygen content was recorded January 13.02 ± 0.166 mg l −1 minimum 9.4 0.05 July site I phase (before reservoir wall). While II (After dam), DO observed month 12.1 8.93 −1. because level minimized almost dried winter. CO 2 Maneri Bhali -Site dam) April 3.10 0.012 . 3.01 0.003 July. Garhwal Himalaya harbors rich aquatic diversity, common endemic species that inhabit fresh Schizothorax species. no. were winter monsoon. At present, these very poor not managed recreational conservation point view. If such developed properly, it can revenue potential state government. Sports, fisheries, tourism should be promoted.