It was shown that both the dates of thinning catches of fish during the season and the type of ponds had a highly significant (p=0.01) effect on the values of 4 investigated traits of the carp body. The highest values of the discussed associations of traits were obtained in carp from 5 experimental ponds and the lowest from a control pond. Towards the end of the season the highest values of increases (W) in body weight were observed in 3 experimental ponds (with fish stocks of 1800 and 2400 indiv. ha-1) and the lowest in the control pond (1200 indiv. ha-1).
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