Abstract
Fishes belonging to the Orders Beloniformes, Cypriniformes, Perciformes, Siluriformes and Synbranchiformes are usually found in the Kangsabati reservoir of West Bengal, India. In recent years among the trapped fishes fishermen failed to get certain fish species which were available to them in the last decade. This prompted us to conduct a survey of ichthyofauna of the said reservoir in respect to the water parameters, keeping in view the anthropogenic activity-induced pollution scenario. It is revealed that the fishes belonging to the species Xenentodon cancila, Nemacheilus savona, Sillaginopsis panijus, Pangasius sutchi, Colisa sota, Mystus cavasius, Mystus seenghala and Mastacembelus armatus are completely absent in the survey area. It is most likely that the eutrophication-induced causes especially, variations in composition and density of plankton as well as the undesirable changes in physical and chemical properties of the water have forced these fishes to migrate elsewhere.
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