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The aim of the present study is to find the toxic effect of fenvalerate, a synthetic pyrethroid pesticide on the gill of a teleost cat fish, Heteropneustes fossilis pesticide after its characterization by Scanning Electron Microscopy (SEM). Three different sublethal doses of fenvalerate dissolved in acetone were used to find the damage on the gills. Fenvalerate found toxic to all the doses given to the test fish. [ABSTRACT FROM AUTHOR]

The count of red blood cells is quite a stable index and the fish body tries to maintain this count within the limits of certain physiological standards using various physiological mechanisms of compensation. In this investigation, changes in H. fossilis blood cells due to therapeutic effect of Ws for 30 days were investigated after 15 days of exposure to fenvalerate. The present study aimed to evaluate the characterization of fenvalerate and ethanolic extract of Withania somnifera (Ws) by infra red spectroscopy (IR) and X-ray Diffraction (XRD) and as blood is patho-physiological indicator, this study gives an insight into toxic effect of fenvalerate and curable protection of Ws. In present study three sublethal doses of fenvalerate [0.25, 0.50 and 0.75 (p.p.m)] were given to test fish, H fossilis for 15 days. After 15 days same fishes were given Ws root extract [(Ws A) 100, (Ws B) 200 and (Ws C) 300 (mg/kg of body wt.)] for 30 days to find its protection after intoxication of fenvalerate. Fenvalerate found harmfull and Ws was protective against doses of fenvalerate. [ABSTRACT FROM AUTHOR]