The Current Research Was Conducted from August 2018 to July 2019 In Uttarakhand, India, To
Examine the Variety of Species and the Influence of Pollution on the Limnological Conditions of the Yamuna
River. Water Samples Were Collected Weekly from Kalsi (S1), Dakpathar (S2), and Asan Lake (S3) Along The
Yamuna River Over the Duration of the Investigation. Phytoplankton, Zooplankton, and Icthyofaunal
Diversity Were Among the Many Biological and Physico-Chemical Characteristics Examined In the Samples.
There Are 35 Taxa In the Phytoplankton, Divided Among Three Families. Bacillariophyceae Has the Greatest
Level of Diversity, Followed By Chlorophyceae and Myxophyceae. As With Zooplankton, 29 Species from Four
Distinct Genera, Including Protozoa, Rotifera, Copepoda, and Ostracoda Were Identified, With Rotifera
Having the Most Diversity. It Was Found That 24 Taxa Belonging to Seven Families and Four Orders Were
Documented In the Icthyofauna. Aquatic Creatures Thrived In the Ideal Physico-Chemical Environment.
Analyzing the Acquired Data, It Was Discovered That the Biological and Physico-Chemical Variables Were
Strongly Correlated. the Presence of Plankton Populations and a Wide Variety of Fish Indicates That The
River Yamuna's Water Quality Is Excellent, With the Expansion of These Ecological Markers of the Aquatic
Environment Being Positively Influenced By Physico-Chemical Parameters.