Abstract 29 species of aquatic insects have been recorded from a weed infested man made wetland near Tamluk Station. Hemiptera was numerically the most abundant group comprising 39% of the total aquatic insects followed by Coleoptera (36%) and Odonata 25%. Hemiptera and Odonata were represented by 10 species each while Coleopteran was represented by 9 species. Of these only one coleopteran species, Canthydrus latitabilis was found to be dominant. The water body under investigation was considered moderately polluted. On the basis of Diversity index, Evenness value and Dominance value indicated the equitability and heterogeneity of the aquatic system. While Coleoptera and Odonata exhibited a peak in July and May respectively but no distinct peak could be seen for Hemiptera. Correlation between the abiotic factors and insect species revealed that abiotic factors had some regulatory effects on aquatic insect population.
Key words: Aquatic Insects; Aquatic Ecosystem; Biodiversity.