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Ichthyofaunal diversity in Nagavali River at Narayanapuram anicut was observed from July 2019 to June 2021. The occurrence of Fifty six fish species belong to nine orders, 19 families and 34 genera. In the present investigation Cypriniformes was contributed to 42.86% of the total species followed by Siluriformes 23.21%, Perciformes 16.07%, Channiformes 7.14%, Osteoglossiformes, Cyprinodontiformes, Ostariophysi, Anguilliformes and Beloiniformes each with1.64.00%. The number and Percentage composition of Population Status is highest of common which contributed to 42.85% followed by abundant which contributed to 25.00%, moderate which contributed to 19.64% and moderate with 12.50%. Shannon-Weiner diversity Index (H) ranged from 0.91 to 1.57. The highest maximum diversity ln(S) was recorded in September and the lowest in April and May 2019 to 2021.
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