Study on efficacy of Rhizorma paridi against the ciliates on giant freshwater shrimp Mactobrachium rosenbergii

Abstract:

To screen out the active parasiticidal components, solvent extractions from Rhizorma paridis were evaluated against ciliates (Zoothamnium sp. and cothurnia) with batch treatment. The bioassay based isolation showed that methanol extract presented 100% antihelmintic efficacy at the concentration of 45 mg/L and the killing active site was proved to be its methanol extract. Meanwhile, the median lethal concentration (LC50) values at 96 h determined from the acute toxicity tests of the killing active site for juvenile giant freshwater shrimp was 272 mg/L. The safety concentration was 111.5 mg/L. The results obtained in this study show that Rhizorma paridis could be a potential plant based medicine for ciliates control.