Ecology, Environment and Conservation Paper

Vol.16, Issue 3, 2010; Page No.(341-345)

INFLUENCE OF LETHAL AND SUBLETHAL CONCENTRATION OF MALATHION ON THE BIOCHEMICAL AND HAEMATOLOGICAL PARAMETERS OF THE FRESH WATER FISH TILAPIA MOSSAMBICA

S. Logaswamy, J. Sakthi and K.M. Remia

Abstract

Effect of an organophosphorous pesticide Malathion, on some biochemical and haematological parameters of the fresh water fish, Tilapia mossambica were investigated under lethal and sub lethal toxicity in the present study. LC50value of malathion to the fish was determined and the parameters were analysed under acute and sublethal toxicity. Biochemical parameters like protein, glucose, cholesterol, haemoglobin, haematocrit, RBC and WBC were analyzed in the blood of fish and all the parameters showed significant changes. The protein content was found to be declined in all the exposure periods and this may be due to proteolysis and uptake of aminoacids into the polypeptide chain under toxicant stress. Hyperglycemic condition was believed to be a responsible to the toxicant stress, which results the mobilization of reserve biochemicals into immediate sources of energy in the form of glucose. Hypocholesteremic condition may be due to utilization of fatty deposits instead of glucose for energy purpose. A significant decline in the levels of haemotological parameters like haemoglobin, haematocrit, Red blood corpuscles (RBC) and White blood corpuscles (WBC) may be the cause of dysfunctioning of haemopoitic system due to toxicant stress, resulting anemia and leucopenia condition in fish. The study clearly reveals that pesticides malathion is highly toxic to the fish, Tilapia mossambica even at low concentration of pesticide.

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