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The effect of hydrogen peroxide (H2O2) for Benedenia sciaenae van Beneden, 1856 (Monogenea : Capsalidae) infestations in cultured meagre Argyrosomus regius Asso, 1801. This research was carried out to evaluate the efficacy of hydrogen peroxide (H2O2) as a treatment for Benedenia sciaenae van Beneden, 1856 infestation in cultured meagre (Argyrosomus regius Asso, 1801). Before the experiment, a total of 1544 parasites were counted on the skin of anesthezied 20 meagre Argyrosomus regius Asso, 1801. Treatment trials were performed by using hydrogen peroxide on three groups. At the end of the trials, a total of 1517 dead parasites were found at the bottom of the an experiment tank, however no parasite was found on the skin of the fish cured and anesthezied for the parasite investigation. Toxications symptoms were not observed in the trials where the temperature was 21 °C and salinity was 40 ppt. The effect of hydrogen peroxide was determined as 98,25%.