Habitat Ecology and Ichthyofaunal Diversity in the Subansiri Sub-Basin, North-East India

B. Bakalial, Shyama Prasad Biswas, L. P. Hazarika, Debojit Baruah, A. Santosh Kumar Singh

Abstract


The instream and riparian zones of the Subansiri offer a variety of microhabitats each having distinct physico-chemical characteristics and fish biota. We recognised 14 habitat types based on their limnological parameters, and collected 204 fish species belonging to 101 genera and 34 families  of which cyprinids were the most dominant (72 species). Ichthyofauna of Subansiri sub-basin was grouped into 10 trophic classes based on their morpho-anatomy of feeding organs and gut contents. The physico-chemical parameters of the river water were  within the permissible limit of BIS except at Chauldhuwaghat where transparency was exceedingly low even during winter months and pH was relatively high (8.2). There is an increasing trend of siltation in the deep pools of the river. The Shannon diversity index ranged from 2.684 to 5.792, with a mean of 4.709±0.943. The maximum value was observed for floodplain lakes from where 54.41% of the fish species were recorded.

Keywords


Fish Biodiversity; Habitat Ecology; Floodplain Lakes; Subansiri River

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