The goal of this research was to analyze the effect of organic Selenium (SelPlex) on the reproductive function in 3 summer old males common carp (Cyprinus carpio), Lausitz variety. The researches were carried out on two groups on a total 12 males carp in 3 summers old (6 in each group). Experimental period was 39 day and organic Selenium (SelPlex) at a dose of 0.03 mg/kg feed was added in the feed for the experimental group. The use of SelPlex significantly influenced the concentration of

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... tozoa of the three summers carp. Analyzing the results obtained shows that the addition of organic selenium in the nutrition of carp breeders caused a slight increase in protein, and fat decreased slightly from sperm, the differences between groups were non-significant (p>0.05%). The slight increase in the amount of protein in milt is due to the positive effect of organic selenium over glutathione peroxidase activity of sperm cores (SN-GSH-Px), which is an integral part of sperm chromatin with the possibility of amino-acid uptake. Researches regarding viability, meristically and somatic measurements of breeders were carried out and significant differences were recorded in the experimental group compared to the control.