EVALUATION OF TOXICITY LEVELS OF THE AQUEOUS EXTRACT OF ALLIUM SATIVUM AND ITS EFFECTS ON THE BEHAVIOR OF JUVENILE COMMON CARP (CYPRINUS CARPIO L., 1758)

Objectives: To evaluate the toxicity levels of the aqueous extract of Allium sativum on Cyprinus carpio.Methods: Fresh garlic (A. sativum) was procured from a local market in Shillong, Meghalaya, India; and the crude aqueous extract of which was used inthe acute toxicity tests to determine the 96 hrs median lethal concentration 50% (96 hrs LC) on juvenile common carp (C. carpio) via bath immersiontreatment.Results: The 96 hrs LC5050 of the aqueous garlic extract for juveniles of C. carpio was estimated to be 253.19 mg/L. Furthermore, fish exposed to thedifferent concentrations of the aqueous garlic extract exhibited abnormal behavior. The susceptibility of C. carpio to the lethal effects of the aqueousgarlic extract was duration and concentration-dependent. Fish mortality was found to be associated with the decrease in pH values.Conclusion: The current study indicates that the aqueous garlic extract has a low toxicity on C. carpio and therefore can be safely used in this speciesfor any experimental purpose. Besides this, it also provides baseline information on the dosage for the aqueous garlic extract to be used as a potentialmanagement tool in aquaculture.Keywords: Garlic, Lethal concentration 50%, Fish, Bath, Treatment