The current study was conducted for a year, from June 2017 to May 2018, to evaluate the water quality state and ichthyofaunal richness of Kapla beel, a well-known freshwater floodplain wetland in Assam’s Barpeta region. During the experiment, various parameters such as water temperature, pH, dissolved oxygen (DO), biological oxygen demand (BOD), total alkalinity, total hardness, free CO2, total solid (TS), total dissolved solid (TDS), total suspended solid (TSS), turbidity, and nitrogen (N), phosphorus (P), and potassium (K) concentrations were measured using the American Public Health Association’s standard protocol (2005). Following suitable taxonomic literature, fish species were collected and identified. Except for TS, TDS, TSS, and N, the most of the water parameters were found to be within acceptable ranges for the ichthyofauna. In terms of some water parameters, the negative effects of numerous anthropogenic activities were observed. During the study period, a total of 65 commercially important fish species were recorded and identified. The wetland as a whole has a lot of ichthyofaunal diversity and good water quality.
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