The results of research on influence of insolation 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 - 12,23 mg O2•dm-3 and at 8 pm - 12,79 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 = 2,40 mg O2•dm-3). The highest oxygen concentration were observed in the afternoon (14 pm) and in the evening (8 pm). Analysis of connection between insolation and dissolved oxygen concentration revealed weak but essential relationship for the results at 8 am, 2 pm and 8 pm. Increase of oxygen concentration was observed with increasing of insolation.
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