spp. water molds severely impact fish health in aquaculture, fish farms and hobby fish tanks colonizing mature and immature stages of fishes, as well as eggs. Considering that there are no drugs licensed for treating and/or control the organism, efficient and environmental low-impact methods to control these oomycetes in aquaculture are needed. The aim of the present report was to evaluate the in vitro sensitivity of to essential oils (EOs) from L., Risso et Poiteau, Burm. f., Macfad, Osbeck, Blume, (Nees ex Steud.) Watson, Mill., Hook.f., (Lour.) Pers., L., L., L'Hér., Merr. & L.M.Perry, and L., by microdilution test. The most effective EOs assayed were and , followed by and These EOs could be of interest for controlling infections. Nevertheless, further safety studies are necessary to evaluate if these products could be dispersed in tank waters, or if their use should be limited to aquaculture supplies.