Volatilization of ammonia is the process where dissolved ammonia gas escapes from the liquid phase and releases into the atmosphere. Rates of natural volatilization are influenced by pH, concentration of ammonia, wind, and temperature, however, the impact of paddlewheel aeration on volatilization has not been measured. This experiment was conducted to determine if volatilization of ammonia by paddlewheel aeration is an effective management technique for aquaculture producers. For this experiment, four 14,000 -L raceways were filled with water at 26.6 ˚C and 22 mg of N/L total ammonia and aerated with 1-hp paddlewheel aerators. Four different pH values were tested: 8, 8.8, 9.5, 10.5 and total ammonia, pH, and temperature were measured every 2, 4, or 12 hours. Higher concentrations of total ammonia lead to faster rates of volatilizations, and water with a higher pH volatilizes ammonia faster than water with a lower pH. As pH rises, a greater proportion of total ammonia concentration exits as ammonia gas (NH₃), whereas in lower pH the ammonium ion (NH₄+) becomes the dominant form which cannot be volatilized. Although 20-25 mg N/L of total ammonia can be volatilized within 24 hours at pH values above 9.5, the concentration of un-ionized ammonia would be lethal for catfish and given the diel swings in pond pH, the duration at this pH would be limited (1-3 hours). Unfortunately, using paddlewheels as an ammonia removal tool is not feasible for most catfish aquaculture ponds.