The potential anthelmintic efficacy of dietary caprylic acid against the monogenean Sparicotyle chrysophrii
in cage-reared gilthead sea bream, Sparus aurata was investigated in this study. The selection of caprylic
acid dosing for the field trials was based on laboratory kinetic experiments performed at 20–21 °C water
temperature. A single in-feed administration of 200 mg/kg fish showed a superior distribution profile
compared to 100 mg/kg fish. Based on samplings performed from 0.5 to 24 h post administration, caprylic
acid tissue levels were measured earlier and remained longer in gilthead sea bream serum, gills and skin
after double dosing while theywere significantly higher compared to low dosing tissue levelswhenmeasurable
concentrations were observed at the same sampling points.