<![CDATA[AbstractNygaardindex is an index which can be used to determine the trophic status of waters, based on phytoplankton composition. To understand the trophic status of the Koto Tibun Reservoir, a research was conducted on February-March 2018. There were three sampling station, namely station 1 (riverin zone), station 2 (transition zone) and station 3 (lacustrin zone). Samplings were conducted 3 times, once/week. Water quality parameters measured were temperature, pH, free CO2, nitrate and phosphate. Results shown that the Nygaard Index values ranged from 2,4-3. The water quality parameters were as follows : temperature : 25.3-25.60C, transparency 75-79 cm, pH 5, free CO2 : 18.64-19.44 mg/L. Based on the Nygaard Index value, the Koto Tibun reservoir can be categorized as mesotrophic to eutrophic. Keyword :Phytoplankton, Koto Tibun Dam, Water Quality Parameters, Mesotrophic ]]>
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