Aquatic Insects As Bio-Indicator Of Water Pollution – A Study On Lower Stretch Of Bahini River, Guwahati, Assam, North East India

The Bahini River (about 14 – 16 Km) located in the south east corner of Guwahati City. This study is a part of bio-monitoring programme using aquatic insect as bio-indicator species of the lower stretch of Bahini River during 2010 – 2012. The study revealed the presence of 8 genera of aquatic insects belonging 7 families and 3 orders. Biological Monitoring Working Party score and Bio-sensitivity Assessment (BSA) index were calculated to find out the status of the water quality of lotic ecosystem.