Efficacy of aqueous extract of “Terminalia catappa” in tambaqui juveniles parasitized by monogenea and, protozoan

Abstract

This study evaluated the efficacy of the aqueous extract of dry Terminalia catappa leaves in juveniles of tambaqui parasited by monogenean and Ichthyophthirius multifiliis and Piscinoodinium pillulare protozoan. Fifty six fish, naturally infested were treated with 40, 80 and 120 ml of extract/L of water. After seven days of exposure to the extract, the fish treated with the highest concentration presented significant decrease of monogenean and P. pillulare number in the mucus and in the gills. However, the extract was not effective against the protozoan I. multifiliis in any tested concentration. The study concludes that the aqueous extract of dry T. catappa, at the concentration of 120 ml/L, was effective against the monogenean and P. pillulare protozoa of juveniles of tambaqui, however it does not produce the same effect against the I. multifiliis protozoan.