Assessing the Impact of Pesticide Contamination on Fish Population in Koshi Region's

Author(s)	Raunaque Parween
Country	India
Abstract	ABSTRACT The Koshi region's aquatic ecosystem faces severe pesticide contamination, threatening fish populations and ecosystem balance. This study investigates pesticide contamination's impact on fish populations, exploring bioaccumulation, physiological responses, and histopathological changes.Methods. A comprehensive field study (January-June 2024) was conducted in the Koshi river basin, covering 20 sampling sites. Water and fish samples (n=100) from three species (Labeo rohita, Catla catla, and Cirrhinus mrigala) were analyzed for pesticide residues using GC-MS/MS and LC-MS/MS. Pesticide residues exceeded safe limits in 80% of water samples (mean concentration: 1.5 μg/L) with organophosphates (45%) and pyrethroids (35%) dominating. Bioaccumulation in fish tissues was significant (p<0.01), leading to altered physiological responses. The study highlights pesticide contamination's severe impact on fish populations, compromising ecosystem resilience. Sustainable agricultural practices, integrated pest management and stringent regulations are necessary. This study provides critical insights into pesticide contamination's effects on Koshi region's fish populations. Urgent measures are necessary to mitigate pesticide pollution.
Keywords	Pesticide contamination, Bioaccumulation, Physiological responses, Histopathological changes.
Field	Biology > Zoology
Published In	Volume 8, Issue 1, January-February 2026
Published On	2026-02-10

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