Monitoring of river health using aquatic insects: A study on Jatinga River, North East India

A biomonitoring study of River Jatinga located in south Assam, north east In-dia was conducted for the first time. The aimed to evaluate water quality river different stretches using aquatic in-sect as bioindicators. Insect samples were collected from selected sites mid-stream and downstream during monsoon- post monsoon, 2018 winter- pre 2019. total 25 families insects recorded 8 orders; Gerridae eudominant midstream across all seasons with highest percentage win-ter. Hemiptera, most di-verse group represented by six relative abundance. found that although both repre-sented same functional feeding groups, there seasonal spatial varia-tions in-sects their occurrences. All biotic indices, BMWPTHAI, SIG-NAL2 scores, EPT % HFBI have shown relatively better than mon-soon monsoon sea-sons. Presence/absence abundance certain insect groups can provide infor-mation about health river.