Study of Seasonal Variations of Macro-invertebrates in River Sikrahana near Chanpatia, West Champaran , Bihar

A study on the impact of sugar mills effluents discharge on the distribution and seasonal biodiversity of macro- invertebrates and water quality of river Sikrahana near Chanpatia, block of District West Champaran, Bihar. About 5 sugar mills of District West Champaran release their effluents in directly in to river water through many tributaries of river Sikrahana. The study was done on this river during Jan 2024- Dec 2024 comprising the physico-chemical paramertes and macro-invertebrate. The benthic macro invertebrates showed a Unimodel pattern of variations during study. The total number of macro-invertebrates, the maximum number was recorded in January (7117 ind./m2) and the minimum in August (1316ind./m2 ). A total number, 13 species were recorded and most dominant group was insect followed by Oligochaetes and Gastropods. The number of macro- invertebrates at Chanpatia especially of Oligochaetes is high due to large inflow of effluents from sugar mills and domestic flow from surrounding areas brings disposal of decaying solid wastes.