Author(s):

Olik Jomang, S Behera, Dibakar Bhakta, Sanjeev Kumar, Snigdha Baksi and Anandamoy Mondal

Abstract: Ninety six hours of toxicity test was conducted to observe the lethal concentration (LC50) value of Zanthoxylum rhetsa seed extracts on a stinging catfish, Heteropneustes fossilis. The fishes were exposed to seven different concentrations of the extract (25 mg l-1, 35 mg l-1, 45 mg l-1, 55 mg l-1, 65 mg l -1, 75 mg l -1and 85 mg l -1) for toxicity test and one remained as control. The LC50 value of Z. rhetsa in H. fossilis was found to be 70.1 mg l-1 for 96 hours exposure periods. Analysis of variance for the effect of the extract on the percentage mortality of fish showed a significant relation between both the factors (p<0.05, F=16.29). The correlation coefficient between concentration and mortality of fish was calculated (R = 0.976) and showed a strong positive correlation between different concentrations of the seed extracts and mortality percentage of fish. The present finding established that Z. rhesta has potential pisicidal effect on fish and could be use widely to control unwanted fishes.

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