Investigation of Lethal toxicity effect of Tannic acid to fresh water fish Mystus Vitatus (Bloch)

Monex Kumar Gupta, Anand Kumar Vishwakrama, Priti Saxsena, Pavan Kumar


Aquatic pollution is a serious and growing problem, with the increasing number of industrial, agricultural and commercial chemicals in the aquatic environment leading to various deleterious effects on organisms. Aquatic ecosystems are dwindling due to unrestricted disposal of wastes and agricultural field chemicals. The present study was undertaken to investigate the lethal toxicity and stress levels of commercial formulations of tannic acid toward freshwater Mystus vittatus. For the assessment of 96 h LC50 values of Tannic acid in the fresh water fish Mystus Vitatus (BLOCH), a range finding test was performed at the six selected concentrations (10 %; 50 %; 100 %; 150%; 200 %) and exposing the fishes at these concentrations for 24 h, 48, 72 and 96 h in a static system. After finding out the number of live and dead fishes at these concentrations, a definitive test was performed by exposing the fishes again at six selected concentrations (10 %; 30 %; 50 %; 70 %; 90 % and 110 %) for 96 h time durations. Finally, the 96h LC50 value of tannic acid obtained in Mystus vittatus was 83 % through Probit analysis using SPSS software. There were large variations in the safe levels estimated by different methods for the tannic acid. In addition to dose and dose-time dependent increase in mortality rate, stress signs in the form of behavioral changes were observed in response to the test concentration.


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