| Hydrogen ion concentration or pH is indicative of the fertility or potential productivity of water body. The present paper deals with the determination of pH of water of Dhanauti River of East Champaran District of Bihar due to its immense role in fish productivity. The water of Dhanauti River was recorded to be alkaline in nature and pH value of its water was found to be in the range of 7.4 to 8.5 at both sampling sites during the study period of one year (January-December, 2010). Minimum value of pH was found to be 7.5 in the month of January while the maximum pH was found to be 8.5 in the month of July at site 1 (Singhia Hiwan) while at Raghunathpur Bank (site 2), the range of pH was noted to be highest in the month of July and August (8.2) and minimum value of pH was found to be 7.4 in the month of May during the study period.
Keywords: Hydrogen Ion Concentration, pH, Productivity, River, Lotic, Dhanauti, Motihari, East Champaran.
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