Abstract.-A study on the fish fauna and water quality parameters of River Swat at Charsadda, Khyber Pakhtunkhwa, Pakistan was conducted, with an aim to determine fresh records of water quality variables and fish fauna after heavy floods of July, 2010 in the province. For fish distribution a 35 km belt of the river was explored for four months and every effort was made to collect the fish specimen by any legal mean. During this study the mean values recorded for physico-chemical parameters were water temperature 19.8°C, pH 7.6, dissolved oxygen 9.65 mg/l, electrical conductivity 199.47 µS/cm, TDS 127.66 mg/l, TSS 93.78 mg/l, total hardness 118.75 mg/l, calcium hardness 75 mg/l, magnesium hardness 43.75 mg/l, sodium 5.325 mg/l, potassium 3.175 mg/l, total alkalinity 97 mg/l, chloride 15.3 mg/l and nitrite 0.0092 mg/l. All these values were within the limits prescribed by the standard methods for the examination of water, sewage and industrial wastes. In the present study a total of 38 fish species belonging to; 6 orders, 9 families and 24 genera were recorded. Cyprinidae was the richest family and was represented by 20 species, Nemacheilidae by 4, Sisoridae by 6, Channidae and Schilbidae by 2, Mastacembelidae, Schilbidae, Belonidae and Chandidae by single species. Results report six (6) species missing in the present study in comparison with the past records
