A Preliminary Study on the Aquatic Insects in Freshwater Wetlands of North Eastern Kolkata

Among various biological components of freshwaters, the aquatic insects play an important role not only in the trophic dynamics of the ecosystem but also in the indication of changes in the quality of water due to pollution or degradation because of their ability to respond, quickly to such changes. While most of the aquatic insect species constitute the food of many commercially important fishes, some others are predaceous, feeding upon spawn and frys or competing with them directly for natural food.