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The present study was carried out of cyanobacterial distribution in three different selected sites of Gossaigaon subdivision, BTR, Assam, India, during June 2015 - July 2016 covering four different seasons only in aquatic environment. Altogether 92 species, belonging to 34 genera and 10 families were found. The maximum number of species was recorded from the family Nostocaceae with 25 species. Among these 42 were simple non-heterocystous, 50 were heterocystous filamentous. Among non-heterocystous forms 36 species were unicellular colonial forms. Studies say habitats have distinct cyanobacterial microflora, but the different sites in different geographical regions evidently fluctuate in their diversity as well as in local climatic conditions. Cyanobacteria can be used for practical purposes in different ways. Even in many countries, cyanobacteria are harvested locally from lake, pond and river to use in different purposes.
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