Summary:

The results of research over influence of air temperature on oxygen condition in carp pond are present in this paper. Mean of dissolved oxygen concentration observed at 8 am were equal 7,18 mg O₂·dm^-3, at 2 pm – 12,76 mg O₂·dm^-3 and at 8 pm – 13,37 mg O₂·dm^-3. Large fluctuations of dissolved oxygen concentration in the euphotic zone of eutrophic fish pond were observed. Oxygen condition lower then lower limit of dissolved oxygen concentration for carp (5 mg O₂·dm^-3) were observed at 8 am (minimum = 2,34 mg O₂·dm^-3). The highest oxygen concentration were observed in the afternoon (14 pm) and in the evening (8 pm). The highest oxygen concentration were equal 25,8 mg O₂·dm^-3. Analysis of connection between air temperature and dissolved oxygen concentration revealed weak but essential relationship for the results from 2 and 8 pm. Increase of oxygen concentration was observed with increase of air temperature.