An Assessment of Physicochemical Parameters of Water in Association with the Ichthyofauna Diversity of river Daya of Odisha, India

Abstract

The present study investigated the seasonal variation in water quality of the Daya River, Odisha, through the analysis of various physicochemical and chemical parameters, and its association with ichthyofaunal diversity. Water samples were collected from selected locations from November 2023 to April 2024, representing pre-monsoon, monsoon, post-monsoon, and winter seasons. A total of 41 fish species belonging to 7 orders, 16 families, and 28 genera were recorded, with Cyprinidae being the most dominant family. Labeo rohita showed the highest abundance in terms of total catch. The water quality remained within permissible limits, although notable seasonal fluctuations were observed in parameters such as dissolved oxygen, BOD, pH, and transparency. Winter season showed better water quality and higher fish diversity, while the monsoon season exhibited increased organic load and turbidity. The ecological indices indicated seasonal shifts in species composition, with signs of pressure from anthropogenic activities such as overfishing and pollution. Conservation and proper management strategies are essential to sustain the ecological balance and protect the native fish diversity of the Daya River..