Assessment of the Ichthyofaunal Diversity in Relation to Physico-Chemical Attributes of the Chathe River (Nagaland), India

Sanjeeb K. Dey Baidya, S. P. Biswas

Abstract


Ichthyofaunal density and diversity of Chumoukedima-seithekima area of the Chathe River in Nagaland (India) was examined for one year in 2016 to create firstever official database and to survey the relationship of fish arrays in connection to some of physicochemical parameters of the stream. Amid this examination around 40 species of 23 genera, 10 families and 4 orders of fishes were encountered in the area of which Cyprinidae was found to rule the conduits with nineteen species. Cyprinids like Barilius bendelisis and Puntius conchonius were recorded as the most predominant and bounteous fishes. Pseudecheneis, Awaous and Mystus were observed to be seasonal visitor in the area. Seasonal variation of physicochemical factors of the stream were observed to be ideal for the survival of aquatic life as prescribed by USEPA with the exception of turbidity, which was observed to be most extreme in July (179-218 NTU) in different survey fragments of the waterway. Diversity of fishes was not critically altered in monsoon season regardless of high turbidity, because of the contribution of other physicochemical factors at their recommended level. Pearson's correlation coefficient between ichthyofaunal diversity indices and various physicochemical parameters of the area were significantly associated. Principal component analysis between ichthyofaunal density (at genus level) and physicochemical variables revealed the degree of association of different fishes towards their environment. Maximum gathering of diverse fishes was recorded in premonsoon followed by postmonsoon season, though lowest diversity was recorded in winter.

Keywords


Physicochemical Characteristics; Ichthyofauna; Diversity; Dominance; Association

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