RESUMO
River Dihing, a tributary of mighty River Brahmaputra is serving as a potential fish habitat. Present investigation was done to identify the ichthyofaunal diversity and its utilization as alternative livelihood. A total 45 species belonging to 7 orders, 17 families and 29 genera were recorded. Among all these Cypriniformes had the majority occupying 40% and were recorded as dominated order. According to IUCN red list of threatened species 2013 (ver. 3.1), it was recorded that 35 were least concern, 5 were near threatened, 1 was vulnerable and 1 was endangered. Most of the people of Dihing River basin had been fruitful from the diversity of fish by fishing and adopting fish culture as an alternative livelihood. Different types of fishing techniques were studied along with the ichthyofaunal diversity.