Abstract: The present work on fish community of the Budhi Gandak river of Samastipur, Bihar in relation to physico-chemical parameters was studied by monthly samples of 10 freshwater fish species taken from January 2021 to December, 2021. The water of the river is used for fishery and irrigation. These 10 fish species belonging to 4 families Labeo rohita, Cirrhinus mrigala, Labeo gonius, Catla catla, Rasbora daniconius, Puntius conchonius, Chanda ranga, Chanda nama, Mystus seenghala, Tilapia mossambica were caught from the Budhi Gandak river. All fishes are useful as commercial, predatory food fishes, which are useful as ornamental and larvicidal fishes. The species diversity is peak in post monsoon, coinciding with favorable conditions such as sufficient water and ample food resources. The diversity was low in pre-monsoon probably due to the shrinkage of the water spread of the river. To save this diversity and to develop a sustainable fishery practices and proper documentation leading to diversity information system is an urgent need.

Keywords: Budhi Gandak river, fish, Physico-chemical

| DOI: 10.17148/IARJSET.2022.9461