Freshwater fish biodiversity in Dikhu River below Longleng District, Northeast India

The present study was conducted on August 2020 to study the diversity of fishes in Dikhu River under Longleng District, Nagaland. The fish species were collected and for identification systematic list and while nomenclature was after FishBase (http//www.fishbase.org). A total of 11 species of fishes, representing 5 orders (Cypriniformes, Siluriformes, Perciformes, Synbranchiformes and Anguilliformes), 9 families (Cyprinidae, Balitoridae, Sisoridae, Siluridae, Heteopneustidae, Bagridae , Mastacembelidae, Anguillidae, Channidae) and 11 genera were collected from the Dikhu River, Longleng District. Among the fish species collected from the river, the order Cypriniformes composed of 37% was the most dominant, followed by Siluriformes composed of 27%, Perciformes composed of 18% and the remaining order Synbranchiformes, Anguilliformes composed of 9% and the number of individual species was highest from the order Cyprinformes (Devio aequipnatus sp.). The short term study does not cover up all the fish species that are found in the river .Therefore, the further study on the diversity of fish can be done.