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Not AvailableThe bark extracts of the plant Zanthoxylum rhetsa have been widely used by people of Arunachal Pradesh as a mean of catching fish. Therefore, the median lethal concentration (LC50) value of Zanthoxylum rhetsa bark extracts on grass carp (Ctenopharyngodon idella) (Valenciennes, 1844) has been determined in the present study. The seeds of Z. rhetsa were collected from the forest of Tarak village, located in the Siang district of Arunachal Pradesh and the toxicity test was conducted in the control condition. Five different concentrations of the extract viz., 25 mg l-1, 35 mg l-1, 45 mg l-1, 55 mg l-1 and 65 mg l-1 were prepared by adding the extracts proportionately to the water. The LC50 value of Z. rhetsa against C. idella was hosted as 45 mg l-1 for 96 h exposure period. Toxicity of aqueous solution of Z. rhetsa against fingerlings of grass carp was found to be time and dose-dependent. It was found that there was a significant (p