Due to extremely high temperatures in the last month, the Toring Turbine team decided to perform measurement of oxygen levels in the Rižana fish farm, where two Toring Turbine aeration systems are currently installed. This fish farming facility is home to 15 tons of American trouts. The purpose of the measurements was to determine the need to install the third aerator unit. On the basis of the obtained results in eleven points of the pond, we can assert that the values are sufficient for normal fish survival, as they are on average 6 mgO2 / l. In the event of a longer period of high temperatures, we recommend the use of a third Toring Turbine unit.